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Finding the Fourth Proportional to 912.50, 1,369.17 and 665.92

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Solution

The fourth proportional to 912.50, 1,369.17 and 665.92 is: 999.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.50 : 1,369.17 = 665.92 : x
  2. Step 2: Convert to fraction form
    912.50/1,369.17 = 665.92/x
  3. Step 3: Cross multiply
    912.50x = 1,369.17 × 665.92
  4. Step 4: Simplify right side
    912.50x = 911,759.40
  5. Step 5: Solve for x
    x = 911,759.40/912.50
  6. Step 6: Final answer
    x = 999.19

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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.