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Finding the Fourth Proportional to 717.45, 1,076.18 and 306.60

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Solution

The fourth proportional to 717.45, 1,076.18 and 306.60 is: 459.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.45 : 1,076.18 = 306.60 : x
  2. Step 2: Convert to fraction form
    717.45/1,076.18 = 306.60/x
  3. Step 3: Cross multiply
    717.45x = 1,076.18 × 306.60
  4. Step 4: Simplify right side
    717.45x = 329,955.26
  5. Step 5: Solve for x
    x = 329,955.26/717.45
  6. Step 6: Final answer
    x = 459.90

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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.