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Finding the Fourth Proportional to 717.89, 1,076.76 and 457.16

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Solution

The fourth proportional to 717.89, 1,076.76 and 457.16 is: 685.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.89 : 1,076.76 = 457.16 : x
  2. Step 2: Convert to fraction form
    717.89/1,076.76 = 457.16/x
  3. Step 3: Cross multiply
    717.89x = 1,076.76 × 457.16
  4. Step 4: Simplify right side
    717.89x = 492,246.22
  5. Step 5: Solve for x
    x = 492,246.22/717.89
  6. Step 6: Final answer
    x = 685.69

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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.