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Finding the Fourth Proportional to 869.61, 1,304.70 and 382.69

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Solution

The fourth proportional to 869.61, 1,304.70 and 382.69 is: 574.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.61 : 1,304.70 = 382.69 : x
  2. Step 2: Convert to fraction form
    869.61/1,304.70 = 382.69/x
  3. Step 3: Cross multiply
    869.61x = 1,304.70 × 382.69
  4. Step 4: Simplify right side
    869.61x = 499,295.64
  5. Step 5: Solve for x
    x = 499,295.64/869.61
  6. Step 6: Final answer
    x = 574.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.