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Finding the Fourth Proportional to 85,687.92, 128,364.48 and 59,029.20

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Solution

The fourth proportional to 85,687.92, 128,364.48 and 59,029.20 is: 88,428.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,687.92 : 128,364.48 = 59,029.20 : x
  2. Step 2: Convert to fraction form
    85,687.92/128,364.48 = 59,029.20/x
  3. Step 3: Cross multiply
    85,687.92x = 128,364.48 × 59,029.20
  4. Step 4: Simplify right side
    85,687.92x = 7,577,252,562.82
  5. Step 5: Solve for x
    x = 7,577,252,562.82/85,687.92
  6. Step 6: Final answer
    x = 88,428.48

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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.