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Finding the Fourth Proportional to 717.55, 991.50 and 560.58

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Solution

The fourth proportional to 717.55, 991.50 and 560.58 is: 774.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.55 : 991.50 = 560.58 : x
  2. Step 2: Convert to fraction form
    717.55/991.50 = 560.58/x
  3. Step 3: Cross multiply
    717.55x = 991.50 × 560.58
  4. Step 4: Simplify right side
    717.55x = 555,815.07
  5. Step 5: Solve for x
    x = 555,815.07/717.55
  6. Step 6: Final answer
    x = 774.60

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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.