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Finding the Fourth Proportional to 68,785.20, 103,080.60 and 42,411.60

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Solution

The fourth proportional to 68,785.20, 103,080.60 and 42,411.60 is: 63,557.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,785.20 : 103,080.60 = 42,411.60 : x
  2. Step 2: Convert to fraction form
    68,785.20/103,080.60 = 42,411.60/x
  3. Step 3: Cross multiply
    68,785.20x = 103,080.60 × 42,411.60
  4. Step 4: Simplify right side
    68,785.20x = 4,371,813,174.96
  5. Step 5: Solve for x
    x = 4,371,813,174.96/68,785.20
  6. Step 6: Final answer
    x = 63,557.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.