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Finding the Fourth Proportional to 266,437.55, 399,638.10 and 86,520.35

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Solution

The fourth proportional to 266,437.55, 399,638.10 and 86,520.35 is: 129,774.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,437.55 : 399,638.10 = 86,520.35 : x
  2. Step 2: Convert to fraction form
    266,437.55/399,638.10 = 86,520.35/x
  3. Step 3: Cross multiply
    266,437.55x = 399,638.10 × 86,520.35
  4. Step 4: Simplify right side
    266,437.55x = 34,576,828,285.34
  5. Step 5: Solve for x
    x = 34,576,828,285.34/266,437.55
  6. Step 6: Final answer
    x = 129,774.61

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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.