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Finding the Fourth Proportional to 21,435, 29,547.90 and 18,434.76

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Solution

The fourth proportional to 21,435, 29,547.90 and 18,434.76 is: 25,412.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,435 : 29,547.90 = 18,434.76 : x
  2. Step 2: Convert to fraction form
    21,435/29,547.90 = 18,434.76/x
  3. Step 3: Cross multiply
    21,435x = 29,547.90 × 18,434.76
  4. Step 4: Simplify right side
    21,435x = 544,708,445.00
  5. Step 5: Solve for x
    x = 544,708,445.00/21,435
  6. Step 6: Final answer
    x = 25,412.10

Related Problems

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Half scale
Find fourth proportional to 42,870, 59,095.80 and 36,869.52
Double scale
Find fourth proportional to 21,436, 29,549.28 and 18,435.76
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.