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Finding the Fourth Proportional to 718.88, 990.24 and 563.36

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Solution

The fourth proportional to 718.88, 990.24 and 563.36 is: 776.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.88 : 990.24 = 563.36 : x
  2. Step 2: Convert to fraction form
    718.88/990.24 = 563.36/x
  3. Step 3: Cross multiply
    718.88x = 990.24 × 563.36
  4. Step 4: Simplify right side
    718.88x = 557,861.61
  5. Step 5: Solve for x
    x = 557,861.61/718.88
  6. Step 6: Final answer
    x = 776.01

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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.