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Finding the Fourth Proportional to 660.68, 991.32 and 574.10

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Solution

The fourth proportional to 660.68, 991.32 and 574.10 is: 861.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.68 : 991.32 = 574.10 : x
  2. Step 2: Convert to fraction form
    660.68/991.32 = 574.10/x
  3. Step 3: Cross multiply
    660.68x = 991.32 × 574.10
  4. Step 4: Simplify right side
    660.68x = 569,116.81
  5. Step 5: Solve for x
    x = 569,116.81/660.68
  6. Step 6: Final answer
    x = 861.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.