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Finding the Fourth Proportional to 586.47, 878.14 and 431.22

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Solution

The fourth proportional to 586.47, 878.14 and 431.22 is: 645.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    586.47 : 878.14 = 431.22 : x
  2. Step 2: Convert to fraction form
    586.47/878.14 = 431.22/x
  3. Step 3: Cross multiply
    586.47x = 878.14 × 431.22
  4. Step 4: Simplify right side
    586.47x = 378,675.36
  5. Step 5: Solve for x
    x = 378,675.36/586.47
  6. Step 6: Final answer
    x = 645.68

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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.