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Finding the Fourth Proportional to 1,115.16, 1,672.49 and 421.91

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Solution

The fourth proportional to 1,115.16, 1,672.49 and 421.91 is: 632.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.16 : 1,672.49 = 421.91 : x
  2. Step 2: Convert to fraction form
    1,115.16/1,672.49 = 421.91/x
  3. Step 3: Cross multiply
    1,115.16x = 1,672.49 × 421.91
  4. Step 4: Simplify right side
    1,115.16x = 705,629.78
  5. Step 5: Solve for x
    x = 705,629.78/1,115.16
  6. Step 6: Final answer
    x = 632.76

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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.