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Finding the Fourth Proportional to 1,275.17, 1,911.54 and 408.89

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Solution

The fourth proportional to 1,275.17, 1,911.54 and 408.89 is: 612.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.17 : 1,911.54 = 408.89 : x
  2. Step 2: Convert to fraction form
    1,275.17/1,911.54 = 408.89/x
  3. Step 3: Cross multiply
    1,275.17x = 1,911.54 × 408.89
  4. Step 4: Simplify right side
    1,275.17x = 781,609.59
  5. Step 5: Solve for x
    x = 781,609.59/1,275.17
  6. Step 6: Final answer
    x = 612.95

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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.