Home / 21,001.79-29,010.08-15,687.38

Finding the Fourth Proportional to 21,001.79, 29,010.08 and 15,687.38

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Solution

The fourth proportional to 21,001.79, 29,010.08 and 15,687.38 is: 21,669.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,001.79 : 29,010.08 = 15,687.38 : x
  2. Step 2: Convert to fraction form
    21,001.79/29,010.08 = 15,687.38/x
  3. Step 3: Cross multiply
    21,001.79x = 29,010.08 × 15,687.38
  4. Step 4: Simplify right side
    21,001.79x = 455,092,148.79
  5. Step 5: Solve for x
    x = 455,092,148.79/21,001.79
  6. Step 6: Final answer
    x = 21,669.21

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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.