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Finding the Fourth Proportional to 711.59, 982.38 and 491.72

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Solution

The fourth proportional to 711.59, 982.38 and 491.72 is: 678.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.59 : 982.38 = 491.72 : x
  2. Step 2: Convert to fraction form
    711.59/982.38 = 491.72/x
  3. Step 3: Cross multiply
    711.59x = 982.38 × 491.72
  4. Step 4: Simplify right side
    711.59x = 483,053.44
  5. Step 5: Solve for x
    x = 483,053.44/711.59
  6. Step 6: Final answer
    x = 678.84

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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.