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Finding the Fourth Proportional to 1,114.76, 1,671.08 and 383.79

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Solution

The fourth proportional to 1,114.76, 1,671.08 and 383.79 is: 575.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.76 : 1,671.08 = 383.79 : x
  2. Step 2: Convert to fraction form
    1,114.76/1,671.08 = 383.79/x
  3. Step 3: Cross multiply
    1,114.76x = 1,671.08 × 383.79
  4. Step 4: Simplify right side
    1,114.76x = 641,340.90
  5. Step 5: Solve for x
    x = 641,340.90/1,114.76
  6. Step 6: Final answer
    x = 575.32

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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.