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Finding the Fourth Proportional to 85,765.14, 128,691.54 and 40,837.32

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Solution

The fourth proportional to 85,765.14, 128,691.54 and 40,837.32 is: 61,276.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,765.14 : 128,691.54 = 40,837.32 : x
  2. Step 2: Convert to fraction form
    85,765.14/128,691.54 = 40,837.32/x
  3. Step 3: Cross multiply
    85,765.14x = 128,691.54 × 40,837.32
  4. Step 4: Simplify right side
    85,765.14x = 5,255,417,600.27
  5. Step 5: Solve for x
    x = 5,255,417,600.27/85,765.14
  6. Step 6: Final answer
    x = 61,276.85

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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.