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Finding the Fourth Proportional to 926.15, 1,278.50 and 611.55

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Solution

The fourth proportional to 926.15, 1,278.50 and 611.55 is: 844.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.15 : 1,278.50 = 611.55 : x
  2. Step 2: Convert to fraction form
    926.15/1,278.50 = 611.55/x
  3. Step 3: Cross multiply
    926.15x = 1,278.50 × 611.55
  4. Step 4: Simplify right side
    926.15x = 781,863.62
  5. Step 5: Solve for x
    x = 781,863.62/926.15
  6. Step 6: Final answer
    x = 844.21

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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.