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Finding the Fourth Proportional to 950.80, 1,424.40 and 813.10

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Solution

The fourth proportional to 950.80, 1,424.40 and 813.10 is: 1,218.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    950.80 : 1,424.40 = 813.10 : x
  2. Step 2: Convert to fraction form
    950.80/1,424.40 = 813.10/x
  3. Step 3: Cross multiply
    950.80x = 1,424.40 × 813.10
  4. Step 4: Simplify right side
    950.80x = 1,158,179.64
  5. Step 5: Solve for x
    x = 1,158,179.64/950.80
  6. Step 6: Final answer
    x = 1,218.11

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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.