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Finding the Fourth Proportional to 711.11, 980.87 and 449.30

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Solution

The fourth proportional to 711.11, 980.87 and 449.30 is: 619.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.11 : 980.87 = 449.30 : x
  2. Step 2: Convert to fraction form
    711.11/980.87 = 449.30/x
  3. Step 3: Cross multiply
    711.11x = 980.87 × 449.30
  4. Step 4: Simplify right side
    711.11x = 440,697.74
  5. Step 5: Solve for x
    x = 440,697.74/711.11
  6. Step 6: Final answer
    x = 619.74

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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.