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Finding the Fourth Proportional to 1,114.86, 1,671.14 and 748.80

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Solution

The fourth proportional to 1,114.86, 1,671.14 and 748.80 is: 1,122.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.86 : 1,671.14 = 748.80 : x
  2. Step 2: Convert to fraction form
    1,114.86/1,671.14 = 748.80/x
  3. Step 3: Cross multiply
    1,114.86x = 1,671.14 × 748.80
  4. Step 4: Simplify right side
    1,114.86x = 1,251,349.63
  5. Step 5: Solve for x
    x = 1,251,349.63/1,114.86
  6. Step 6: Final answer
    x = 1,122.43

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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.