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Finding the Fourth Proportional to 101,712.78, 140,368.06 and 56,387.88

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Solution

The fourth proportional to 101,712.78, 140,368.06 and 56,387.88 is: 77,817.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,712.78 : 140,368.06 = 56,387.88 : x
  2. Step 2: Convert to fraction form
    101,712.78/140,368.06 = 56,387.88/x
  3. Step 3: Cross multiply
    101,712.78x = 140,368.06 × 56,387.88
  4. Step 4: Simplify right side
    101,712.78x = 7,915,057,323.11
  5. Step 5: Solve for x
    x = 7,915,057,323.11/101,712.78
  6. Step 6: Final answer
    x = 77,817.73

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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.