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Finding the Fourth Proportional to 1,253.97, 1,880.85 and 388.29

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Solution

The fourth proportional to 1,253.97, 1,880.85 and 388.29 is: 582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.97 : 1,880.85 = 388.29 : x
  2. Step 2: Convert to fraction form
    1,253.97/1,880.85 = 388.29/x
  3. Step 3: Cross multiply
    1,253.97x = 1,880.85 × 388.29
  4. Step 4: Simplify right side
    1,253.97x = 730,315.25
  5. Step 5: Solve for x
    x = 730,315.25/1,253.97
  6. Step 6: Final answer
    x = 582.40

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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.