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Finding the Fourth Proportional to 717.61, 1,076.82 and 307.15

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Solution

The fourth proportional to 717.61, 1,076.82 and 307.15 is: 460.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.61 : 1,076.82 = 307.15 : x
  2. Step 2: Convert to fraction form
    717.61/1,076.82 = 307.15/x
  3. Step 3: Cross multiply
    717.61x = 1,076.82 × 307.15
  4. Step 4: Simplify right side
    717.61x = 330,745.26
  5. Step 5: Solve for x
    x = 330,745.26/717.61
  6. Step 6: Final answer
    x = 460.90

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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.