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Finding the Fourth Proportional to 718.79, 990.91 and 563.27

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Solution

The fourth proportional to 718.79, 990.91 and 563.27 is: 776.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.79 : 990.91 = 563.27 : x
  2. Step 2: Convert to fraction form
    718.79/990.91 = 563.27/x
  3. Step 3: Cross multiply
    718.79x = 990.91 × 563.27
  4. Step 4: Simplify right side
    718.79x = 558,149.88
  5. Step 5: Solve for x
    x = 558,149.88/718.79
  6. Step 6: Final answer
    x = 776.51

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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.