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Finding the Fourth Proportional to 266,415.87, 399,686.60 and 86,487.44

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Solution

The fourth proportional to 266,415.87, 399,686.60 and 86,487.44 is: 129,751.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,415.87 : 399,686.60 = 86,487.44 : x
  2. Step 2: Convert to fraction form
    266,415.87/399,686.60 = 86,487.44/x
  3. Step 3: Cross multiply
    266,415.87x = 399,686.60 × 86,487.44
  4. Step 4: Simplify right side
    266,415.87x = 34,567,868,405.43
  5. Step 5: Solve for x
    x = 34,567,868,405.43/266,415.87
  6. Step 6: Final answer
    x = 129,751.54

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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.