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Finding the Fourth Proportional to 101,700.78, 140,346.69 and 56,988.78

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Solution

The fourth proportional to 101,700.78, 140,346.69 and 56,988.78 is: 78,644.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,700.78 : 140,346.69 = 56,988.78 : x
  2. Step 2: Convert to fraction form
    101,700.78/140,346.69 = 56,988.78/x
  3. Step 3: Cross multiply
    101,700.78x = 140,346.69 × 56,988.78
  4. Step 4: Simplify right side
    101,700.78x = 7,998,186,640.14
  5. Step 5: Solve for x
    x = 7,998,186,640.14/101,700.78
  6. Step 6: Final answer
    x = 78,644.30

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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.