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Finding the Fourth Proportional to 71,618.34, 106,901.80 and 66,340.38

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Solution

The fourth proportional to 71,618.34, 106,901.80 and 66,340.38 is: 99,023.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,618.34 : 106,901.80 = 66,340.38 : x
  2. Step 2: Convert to fraction form
    71,618.34/106,901.80 = 66,340.38/x
  3. Step 3: Cross multiply
    71,618.34x = 106,901.80 × 66,340.38
  4. Step 4: Simplify right side
    71,618.34x = 7,091,905,500.18
  5. Step 5: Solve for x
    x = 7,091,905,500.18/71,618.34
  6. Step 6: Final answer
    x = 99,023.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.