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Finding the Fourth Proportional to 912.36, 1,369.12 and 479.82

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Solution

The fourth proportional to 912.36, 1,369.12 and 479.82 is: 720.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.36 : 1,369.12 = 479.82 : x
  2. Step 2: Convert to fraction form
    912.36/1,369.12 = 479.82/x
  3. Step 3: Cross multiply
    912.36x = 1,369.12 × 479.82
  4. Step 4: Simplify right side
    912.36x = 656,931.16
  5. Step 5: Solve for x
    x = 656,931.16/912.36
  6. Step 6: Final answer
    x = 720.04

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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.