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Finding the Fourth Proportional to 85,760.80, 128,468.40 and 48,781.60

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Solution

The fourth proportional to 85,760.80, 128,468.40 and 48,781.60 is: 73,074.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,760.80 : 128,468.40 = 48,781.60 : x
  2. Step 2: Convert to fraction form
    85,760.80/128,468.40 = 48,781.60/x
  3. Step 3: Cross multiply
    85,760.80x = 128,468.40 × 48,781.60
  4. Step 4: Simplify right side
    85,760.80x = 6,266,894,101.44
  5. Step 5: Solve for x
    x = 6,266,894,101.44/85,760.80
  6. Step 6: Final answer
    x = 73,074.11

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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.