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Finding the Fourth Proportional to 912.25, 1,368.78 and 479.31

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Solution

The fourth proportional to 912.25, 1,368.78 and 479.31 is: 719.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.25 : 1,368.78 = 479.31 : x
  2. Step 2: Convert to fraction form
    912.25/1,368.78 = 479.31/x
  3. Step 3: Cross multiply
    912.25x = 1,368.78 × 479.31
  4. Step 4: Simplify right side
    912.25x = 656,069.94
  5. Step 5: Solve for x
    x = 656,069.94/912.25
  6. Step 6: Final answer
    x = 719.18

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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.