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Finding the Fourth Proportional to 717.36, 1,074.32 and 391.92

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Solution

The fourth proportional to 717.36, 1,074.32 and 391.92 is: 586.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.36 : 1,074.32 = 391.92 : x
  2. Step 2: Convert to fraction form
    717.36/1,074.32 = 391.92/x
  3. Step 3: Cross multiply
    717.36x = 1,074.32 × 391.92
  4. Step 4: Simplify right side
    717.36x = 421,047.49
  5. Step 5: Solve for x
    x = 421,047.49/717.36
  6. Step 6: Final answer
    x = 586.94

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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.