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Finding the Fourth Proportional to 620.58, 931.16 and 439.14

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Solution

The fourth proportional to 620.58, 931.16 and 439.14 is: 658.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.58 : 931.16 = 439.14 : x
  2. Step 2: Convert to fraction form
    620.58/931.16 = 439.14/x
  3. Step 3: Cross multiply
    620.58x = 931.16 × 439.14
  4. Step 4: Simplify right side
    620.58x = 408,909.60
  5. Step 5: Solve for x
    x = 408,909.60/620.58
  6. Step 6: Final answer
    x = 658.92

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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.