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Finding the Fourth Proportional to 951.80, 1,312.43 and 818.87

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Solution

The fourth proportional to 951.80, 1,312.43 and 818.87 is: 1,129.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.80 : 1,312.43 = 818.87 : x
  2. Step 2: Convert to fraction form
    951.80/1,312.43 = 818.87/x
  3. Step 3: Cross multiply
    951.80x = 1,312.43 × 818.87
  4. Step 4: Simplify right side
    951.80x = 1,074,698.90
  5. Step 5: Solve for x
    x = 1,074,698.90/951.80
  6. Step 6: Final answer
    x = 1,129.13

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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.