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Finding the Fourth Proportional to 138,969.60, 208,551.60 and 60,140.40

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Solution

The fourth proportional to 138,969.60, 208,551.60 and 60,140.40 is: 90,252.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,969.60 : 208,551.60 = 60,140.40 : x
  2. Step 2: Convert to fraction form
    138,969.60/208,551.60 = 60,140.40/x
  3. Step 3: Cross multiply
    138,969.60x = 208,551.60 × 60,140.40
  4. Step 4: Simplify right side
    138,969.60x = 12,542,376,644.64
  5. Step 5: Solve for x
    x = 12,542,376,644.64/138,969.60
  6. Step 6: Final answer
    x = 90,252.66

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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.