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Finding the Fourth Proportional to 660.56, 990.25 and 352.13

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Solution

The fourth proportional to 660.56, 990.25 and 352.13 is: 527.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.56 : 990.25 = 352.13 : x
  2. Step 2: Convert to fraction form
    660.56/990.25 = 352.13/x
  3. Step 3: Cross multiply
    660.56x = 990.25 × 352.13
  4. Step 4: Simplify right side
    660.56x = 348,690.90
  5. Step 5: Solve for x
    x = 348,690.90/660.56
  6. Step 6: Final answer
    x = 527.88

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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.