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Finding the Fourth Proportional to 662.79, 991.76 and 559.11

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Solution

The fourth proportional to 662.79, 991.76 and 559.11 is: 836.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.79 : 991.76 = 559.11 : x
  2. Step 2: Convert to fraction form
    662.79/991.76 = 559.11/x
  3. Step 3: Cross multiply
    662.79x = 991.76 × 559.11
  4. Step 4: Simplify right side
    662.79x = 554,500.14
  5. Step 5: Solve for x
    x = 554,500.14/662.79
  6. Step 6: Final answer
    x = 836.62

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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.