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Finding the Fourth Proportional to 85,877.10, 128,815.65 and 76,691.70

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Solution

The fourth proportional to 85,877.10, 128,815.65 and 76,691.70 is: 115,037.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,877.10 : 128,815.65 = 76,691.70 : x
  2. Step 2: Convert to fraction form
    85,877.10/128,815.65 = 76,691.70/x
  3. Step 3: Cross multiply
    85,877.10x = 128,815.65 × 76,691.70
  4. Step 4: Simplify right side
    85,877.10x = 9,879,091,185.11
  5. Step 5: Solve for x
    x = 9,879,091,185.11/85,877.10
  6. Step 6: Final answer
    x = 115,037.55

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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.