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Finding the Fourth Proportional to 1,586.16, 2,379.16 and 431.88

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Solution

The fourth proportional to 1,586.16, 2,379.16 and 431.88 is: 647.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.16 : 2,379.16 = 431.88 : x
  2. Step 2: Convert to fraction form
    1,586.16/2,379.16 = 431.88/x
  3. Step 3: Cross multiply
    1,586.16x = 2,379.16 × 431.88
  4. Step 4: Simplify right side
    1,586.16x = 1,027,511.62
  5. Step 5: Solve for x
    x = 1,027,511.62/1,586.16
  6. Step 6: Final answer
    x = 647.80

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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.