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Finding the Fourth Proportional to 90,601.70, 135,902.55 and 57,140.60

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Solution

The fourth proportional to 90,601.70, 135,902.55 and 57,140.60 is: 85,710.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,601.70 : 135,902.55 = 57,140.60 : x
  2. Step 2: Convert to fraction form
    90,601.70/135,902.55 = 57,140.60/x
  3. Step 3: Cross multiply
    90,601.70x = 135,902.55 × 57,140.60
  4. Step 4: Simplify right side
    90,601.70x = 7,765,553,248.53
  5. Step 5: Solve for x
    x = 7,765,553,248.53/90,601.70
  6. Step 6: Final answer
    x = 85,710.90

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1.5x scale

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.