Home / 21,078.68-29,102.15-13,528.27

Finding the Fourth Proportional to 21,078.68, 29,102.15 and 13,528.27

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Solution

The fourth proportional to 21,078.68, 29,102.15 and 13,528.27 is: 18,677.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.68 : 29,102.15 = 13,528.27 : x
  2. Step 2: Convert to fraction form
    21,078.68/29,102.15 = 13,528.27/x
  3. Step 3: Cross multiply
    21,078.68x = 29,102.15 × 13,528.27
  4. Step 4: Simplify right side
    21,078.68x = 393,701,602.38
  5. Step 5: Solve for x
    x = 393,701,602.38/21,078.68
  6. Step 6: Final answer
    x = 18,677.71

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Half scale
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Double scale
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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.