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Finding the Fourth Proportional to 865.05, 1,193.71 and 491.98

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Solution

The fourth proportional to 865.05, 1,193.71 and 491.98 is: 678.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.05 : 1,193.71 = 491.98 : x
  2. Step 2: Convert to fraction form
    865.05/1,193.71 = 491.98/x
  3. Step 3: Cross multiply
    865.05x = 1,193.71 × 491.98
  4. Step 4: Simplify right side
    865.05x = 587,281.45
  5. Step 5: Solve for x
    x = 587,281.45/865.05
  6. Step 6: Final answer
    x = 678.90

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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.