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Finding the Fourth Proportional to 100,666.30, 138,915.95 and 55,343.95

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Solution

The fourth proportional to 100,666.30, 138,915.95 and 55,343.95 is: 76,372.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,666.30 : 138,915.95 = 55,343.95 : x
  2. Step 2: Convert to fraction form
    100,666.30/138,915.95 = 55,343.95/x
  3. Step 3: Cross multiply
    100,666.30x = 138,915.95 × 55,343.95
  4. Step 4: Simplify right side
    100,666.30x = 7,688,157,391.00
  5. Step 5: Solve for x
    x = 7,688,157,391.00/100,666.30
  6. Step 6: Final answer
    x = 76,372.70

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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.