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Finding the Fourth Proportional to 85,508.91, 128,150.37 and 61,895.39

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Solution

The fourth proportional to 85,508.91, 128,150.37 and 61,895.39 is: 92,761.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,508.91 : 128,150.37 = 61,895.39 : x
  2. Step 2: Convert to fraction form
    85,508.91/128,150.37 = 61,895.39/x
  3. Step 3: Cross multiply
    85,508.91x = 128,150.37 × 61,895.39
  4. Step 4: Simplify right side
    85,508.91x = 7,931,916,489.04
  5. Step 5: Solve for x
    x = 7,931,916,489.04/85,508.91
  6. Step 6: Final answer
    x = 92,761.29

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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.