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Finding the Fourth Proportional to 1,114.78, 1,671.92 and 421.53

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Solution

The fourth proportional to 1,114.78, 1,671.92 and 421.53 is: 632.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.78 : 1,671.92 = 421.53 : x
  2. Step 2: Convert to fraction form
    1,114.78/1,671.92 = 421.53/x
  3. Step 3: Cross multiply
    1,114.78x = 1,671.92 × 421.53
  4. Step 4: Simplify right side
    1,114.78x = 704,764.44
  5. Step 5: Solve for x
    x = 704,764.44/1,114.78
  6. Step 6: Final answer
    x = 632.20

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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.