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Finding the Fourth Proportional to 85,138.80, 127,535.40 and 48,159.60

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Solution

The fourth proportional to 85,138.80, 127,535.40 and 48,159.60 is: 72,141.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,138.80 : 127,535.40 = 48,159.60 : x
  2. Step 2: Convert to fraction form
    85,138.80/127,535.40 = 48,159.60/x
  3. Step 3: Cross multiply
    85,138.80x = 127,535.40 × 48,159.60
  4. Step 4: Simplify right side
    85,138.80x = 6,142,053,849.84
  5. Step 5: Solve for x
    x = 6,142,053,849.84/85,138.80
  6. Step 6: Final answer
    x = 72,141.65

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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.