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Finding the Fourth Proportional to 85,565.80, 128,175.90 and 48,586.60

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Solution

The fourth proportional to 85,565.80, 128,175.90 and 48,586.60 is: 72,781.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,565.80 : 128,175.90 = 48,586.60 : x
  2. Step 2: Convert to fraction form
    85,565.80/128,175.90 = 48,586.60/x
  3. Step 3: Cross multiply
    85,565.80x = 128,175.90 × 48,586.60
  4. Step 4: Simplify right side
    85,565.80x = 6,227,631,182.94
  5. Step 5: Solve for x
    x = 6,227,631,182.94/85,565.80
  6. Step 6: Final answer
    x = 72,781.78

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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.