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Finding the Fourth Proportional to 864.85, 1,193.67 and 491.86

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Solution

The fourth proportional to 864.85, 1,193.67 and 491.86 is: 678.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.85 : 1,193.67 = 491.86 : x
  2. Step 2: Convert to fraction form
    864.85/1,193.67 = 491.86/x
  3. Step 3: Cross multiply
    864.85x = 1,193.67 × 491.86
  4. Step 4: Simplify right side
    864.85x = 587,118.53
  5. Step 5: Solve for x
    x = 587,118.53/864.85
  6. Step 6: Final answer
    x = 678.87

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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.