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Finding the Fourth Proportional to 711.86, 982.16 and 487.80

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Solution

The fourth proportional to 711.86, 982.16 and 487.80 is: 673.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.86 : 982.16 = 487.80 : x
  2. Step 2: Convert to fraction form
    711.86/982.16 = 487.80/x
  3. Step 3: Cross multiply
    711.86x = 982.16 × 487.80
  4. Step 4: Simplify right side
    711.86x = 479,097.65
  5. Step 5: Solve for x
    x = 479,097.65/711.86
  6. Step 6: Final answer
    x = 673.02

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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.