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Finding the Fourth Proportional to 139,938.13, 209,803.52 and 84,521.17

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Solution

The fourth proportional to 139,938.13, 209,803.52 and 84,521.17 is: 126,719.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,938.13 : 209,803.52 = 84,521.17 : x
  2. Step 2: Convert to fraction form
    139,938.13/209,803.52 = 84,521.17/x
  3. Step 3: Cross multiply
    139,938.13x = 209,803.52 × 84,521.17
  4. Step 4: Simplify right side
    139,938.13x = 17,732,838,557.91
  5. Step 5: Solve for x
    x = 17,732,838,557.91/139,938.13
  6. Step 6: Final answer
    x = 126,719.13

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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.