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Finding the Fourth Proportional to 711.32, 981.33 and 449.30

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Solution

The fourth proportional to 711.32, 981.33 and 449.30 is: 619.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.32 : 981.33 = 449.30 : x
  2. Step 2: Convert to fraction form
    711.32/981.33 = 449.30/x
  3. Step 3: Cross multiply
    711.32x = 981.33 × 449.30
  4. Step 4: Simplify right side
    711.32x = 440,911.57
  5. Step 5: Solve for x
    x = 440,911.57/711.32
  6. Step 6: Final answer
    x = 619.85

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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.