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Finding the Fourth Proportional to 1,254.78, 1,730.97 and 782.55

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Solution

The fourth proportional to 1,254.78, 1,730.97 and 782.55 is: 1,079.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254.78 : 1,730.97 = 782.55 : x
  2. Step 2: Convert to fraction form
    1,254.78/1,730.97 = 782.55/x
  3. Step 3: Cross multiply
    1,254.78x = 1,730.97 × 782.55
  4. Step 4: Simplify right side
    1,254.78x = 1,354,570.57
  5. Step 5: Solve for x
    x = 1,354,570.57/1,254.78
  6. Step 6: Final answer
    x = 1,079.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.