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Finding the Fourth Proportional to 912.16, 1,370.67 and 625.42

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Solution

The fourth proportional to 912.16, 1,370.67 and 625.42 is: 939.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.16 : 1,370.67 = 625.42 : x
  2. Step 2: Convert to fraction form
    912.16/1,370.67 = 625.42/x
  3. Step 3: Cross multiply
    912.16x = 1,370.67 × 625.42
  4. Step 4: Simplify right side
    912.16x = 857,244.43
  5. Step 5: Solve for x
    x = 857,244.43/912.16
  6. Step 6: Final answer
    x = 939.80

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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.