Home / 21,240.39-31,869.30-9,387.90

Finding the Fourth Proportional to 21,240.39, 31,869.30 and 9,387.90

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Solution

The fourth proportional to 21,240.39, 31,869.30 and 9,387.90 is: 14,085.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240.39 : 31,869.30 = 9,387.90 : x
  2. Step 2: Convert to fraction form
    21,240.39/31,869.30 = 9,387.90/x
  3. Step 3: Cross multiply
    21,240.39x = 31,869.30 × 9,387.90
  4. Step 4: Simplify right side
    21,240.39x = 299,185,801.47
  5. Step 5: Solve for x
    x = 299,185,801.47/21,240.39
  6. Step 6: Final answer
    x = 14,085.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.