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Finding the Fourth Proportional to 555.14, 831.50 and 439.72

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Solution

The fourth proportional to 555.14, 831.50 and 439.72 is: 658.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.14 : 831.50 = 439.72 : x
  2. Step 2: Convert to fraction form
    555.14/831.50 = 439.72/x
  3. Step 3: Cross multiply
    555.14x = 831.50 × 439.72
  4. Step 4: Simplify right side
    555.14x = 365,624.55
  5. Step 5: Solve for x
    x = 365,624.55/555.14
  6. Step 6: Final answer
    x = 658.61

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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.