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Finding the Fourth Proportional to 912.32, 1,369.02 and 479.60

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Solution

The fourth proportional to 912.32, 1,369.02 and 479.60 is: 719.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.32 : 1,369.02 = 479.60 : x
  2. Step 2: Convert to fraction form
    912.32/1,369.02 = 479.60/x
  3. Step 3: Cross multiply
    912.32x = 1,369.02 × 479.60
  4. Step 4: Simplify right side
    912.32x = 656,581.99
  5. Step 5: Solve for x
    x = 656,581.99/912.32
  6. Step 6: Final answer
    x = 719.68

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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.