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Finding the Fourth Proportional to 1,318.38, 1,974.84 and 953.88

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Solution

The fourth proportional to 1,318.38, 1,974.84 and 953.88 is: 1,428.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.38 : 1,974.84 = 953.88 : x
  2. Step 2: Convert to fraction form
    1,318.38/1,974.84 = 953.88/x
  3. Step 3: Cross multiply
    1,318.38x = 1,974.84 × 953.88
  4. Step 4: Simplify right side
    1,318.38x = 1,883,760.38
  5. Step 5: Solve for x
    x = 1,883,760.38/1,318.38
  6. Step 6: Final answer
    x = 1,428.84

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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.