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Finding the Fourth Proportional to 716.79, 988.16 and 561.27

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Solution

The fourth proportional to 716.79, 988.16 and 561.27 is: 773.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.79 : 988.16 = 561.27 : x
  2. Step 2: Convert to fraction form
    716.79/988.16 = 561.27/x
  3. Step 3: Cross multiply
    716.79x = 988.16 × 561.27
  4. Step 4: Simplify right side
    716.79x = 554,621.76
  5. Step 5: Solve for x
    x = 554,621.76/716.79
  6. Step 6: Final answer
    x = 773.76

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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.