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Finding the Fourth Proportional to 744, 1,024.29 and 660.78

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Solution

The fourth proportional to 744, 1,024.29 and 660.78 is: 909.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    744 : 1,024.29 = 660.78 : x
  2. Step 2: Convert to fraction form
    744/1,024.29 = 660.78/x
  3. Step 3: Cross multiply
    744x = 1,024.29 × 660.78
  4. Step 4: Simplify right side
    744x = 676,830.35
  5. Step 5: Solve for x
    x = 676,830.35/744
  6. Step 6: Final answer
    x = 909.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.