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Finding the Fourth Proportional to 1,385.67, 2,078.54 and 461.29

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Solution

The fourth proportional to 1,385.67, 2,078.54 and 461.29 is: 691.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.67 : 2,078.54 = 461.29 : x
  2. Step 2: Convert to fraction form
    1,385.67/2,078.54 = 461.29/x
  3. Step 3: Cross multiply
    1,385.67x = 2,078.54 × 461.29
  4. Step 4: Simplify right side
    1,385.67x = 958,809.72
  5. Step 5: Solve for x
    x = 958,809.72/1,385.67
  6. Step 6: Final answer
    x = 691.95

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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.