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Finding the Fourth Proportional to 85,960.64, 129,138.64 and 61,061.28

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Solution

The fourth proportional to 85,960.64, 129,138.64 and 61,061.28 is: 91,732.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,960.64 : 129,138.64 = 61,061.28 : x
  2. Step 2: Convert to fraction form
    85,960.64/129,138.64 = 61,061.28/x
  3. Step 3: Cross multiply
    85,960.64x = 129,138.64 × 61,061.28
  4. Step 4: Simplify right side
    85,960.64x = 7,885,370,655.86
  5. Step 5: Solve for x
    x = 7,885,370,655.86/85,960.64
  6. Step 6: Final answer
    x = 91,732.34

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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.