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Finding the Fourth Proportional to 661.32, 991.86 and 353.16

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Solution

The fourth proportional to 661.32, 991.86 and 353.16 is: 529.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.32 : 991.86 = 353.16 : x
  2. Step 2: Convert to fraction form
    661.32/991.86 = 353.16/x
  3. Step 3: Cross multiply
    661.32x = 991.86 × 353.16
  4. Step 4: Simplify right side
    661.32x = 350,285.28
  5. Step 5: Solve for x
    x = 350,285.28/661.32
  6. Step 6: Final answer
    x = 529.68

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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.