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Finding the Fourth Proportional to 719.24, 990.90 and 563.72

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Solution

The fourth proportional to 719.24, 990.90 and 563.72 is: 776.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.24 : 990.90 = 563.72 : x
  2. Step 2: Convert to fraction form
    719.24/990.90 = 563.72/x
  3. Step 3: Cross multiply
    719.24x = 990.90 × 563.72
  4. Step 4: Simplify right side
    719.24x = 558,590.15
  5. Step 5: Solve for x
    x = 558,590.15/719.24
  6. Step 6: Final answer
    x = 776.64

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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.