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Finding the Fourth Proportional to 100,805.28, 139,053.34 and 63,013.92

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Solution

The fourth proportional to 100,805.28, 139,053.34 and 63,013.92 is: 86,922.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,805.28 : 139,053.34 = 63,013.92 : x
  2. Step 2: Convert to fraction form
    100,805.28/139,053.34 = 63,013.92/x
  3. Step 3: Cross multiply
    100,805.28x = 139,053.34 × 63,013.92
  4. Step 4: Simplify right side
    100,805.28x = 8,762,296,042.49
  5. Step 5: Solve for x
    x = 8,762,296,042.49/100,805.28
  6. Step 6: Final answer
    x = 86,922.99

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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.