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Finding the Fourth Proportional to 266,507.55, 399,743.10 and 86,590.35

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Solution

The fourth proportional to 266,507.55, 399,743.10 and 86,590.35 is: 129,879.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,507.55 : 399,743.10 = 86,590.35 : x
  2. Step 2: Convert to fraction form
    266,507.55/399,743.10 = 86,590.35/x
  3. Step 3: Cross multiply
    266,507.55x = 399,743.10 × 86,590.35
  4. Step 4: Simplify right side
    266,507.55x = 34,613,894,939.09
  5. Step 5: Solve for x
    x = 34,613,894,939.09/266,507.55
  6. Step 6: Final answer
    x = 129,879.60

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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.