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Finding the Fourth Proportional to 85,655.68, 128,439.15 and 45,663.91

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Solution

The fourth proportional to 85,655.68, 128,439.15 and 45,663.91 is: 68,472.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,655.68 : 128,439.15 = 45,663.91 : x
  2. Step 2: Convert to fraction form
    85,655.68/128,439.15 = 45,663.91/x
  3. Step 3: Cross multiply
    85,655.68x = 128,439.15 × 45,663.91
  4. Step 4: Simplify right side
    85,655.68x = 5,865,033,138.20
  5. Step 5: Solve for x
    x = 5,865,033,138.20/85,655.68
  6. Step 6: Final answer
    x = 68,472.21

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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.