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Finding the Fourth Proportional to 1,115.27, 1,672.60 and 384.65

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Solution

The fourth proportional to 1,115.27, 1,672.60 and 384.65 is: 576.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.27 : 1,672.60 = 384.65 : x
  2. Step 2: Convert to fraction form
    1,115.27/1,672.60 = 384.65/x
  3. Step 3: Cross multiply
    1,115.27x = 1,672.60 × 384.65
  4. Step 4: Simplify right side
    1,115.27x = 643,365.59
  5. Step 5: Solve for x
    x = 643,365.59/1,115.27
  6. Step 6: Final answer
    x = 576.87

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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.