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Finding the Fourth Proportional to 85,672.20, 128,508.30 and 57,678.60

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Solution

The fourth proportional to 85,672.20, 128,508.30 and 57,678.60 is: 86,517.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,672.20 : 128,508.30 = 57,678.60 : x
  2. Step 2: Convert to fraction form
    85,672.20/128,508.30 = 57,678.60/x
  3. Step 3: Cross multiply
    85,672.20x = 128,508.30 × 57,678.60
  4. Step 4: Simplify right side
    85,672.20x = 7,412,178,832.38
  5. Step 5: Solve for x
    x = 7,412,178,832.38/85,672.20
  6. Step 6: Final answer
    x = 86,517.90

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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.