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Finding the Fourth Proportional to 869.49, 1,304.35 and 253.11

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Solution

The fourth proportional to 869.49, 1,304.35 and 253.11 is: 379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.49 : 1,304.35 = 253.11 : x
  2. Step 2: Convert to fraction form
    869.49/1,304.35 = 253.11/x
  3. Step 3: Cross multiply
    869.49x = 1,304.35 × 253.11
  4. Step 4: Simplify right side
    869.49x = 330,144.66
  5. Step 5: Solve for x
    x = 330,144.66/869.49
  6. Step 6: Final answer
    x = 379.70

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Double scale
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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.