Home / 21,302.38-29,378.10-13,345.30

Finding the Fourth Proportional to 21,302.38, 29,378.10 and 13,345.30

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Solution

The fourth proportional to 21,302.38, 29,378.10 and 13,345.30 is: 18,404.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,302.38 : 29,378.10 = 13,345.30 : x
  2. Step 2: Convert to fraction form
    21,302.38/29,378.10 = 13,345.30/x
  3. Step 3: Cross multiply
    21,302.38x = 29,378.10 × 13,345.30
  4. Step 4: Simplify right side
    21,302.38x = 392,059,557.93
  5. Step 5: Solve for x
    x = 392,059,557.93/21,302.38
  6. Step 6: Final answer
    x = 18,404.50

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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.