Home / 21,178.81-29,214.52-13,207.20

Finding the Fourth Proportional to 21,178.81, 29,214.52 and 13,207.20

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Solution

The fourth proportional to 21,178.81, 29,214.52 and 13,207.20 is: 18,218.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,178.81 : 29,214.52 = 13,207.20 : x
  2. Step 2: Convert to fraction form
    21,178.81/29,214.52 = 13,207.20/x
  3. Step 3: Cross multiply
    21,178.81x = 29,214.52 × 13,207.20
  4. Step 4: Simplify right side
    21,178.81x = 385,842,008.54
  5. Step 5: Solve for x
    x = 385,842,008.54/21,178.81
  6. Step 6: Final answer
    x = 18,218.30

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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.