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Finding the Fourth Proportional to 950.80, 1,319.50 and 912.40

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Solution

The fourth proportional to 950.80, 1,319.50 and 912.40 is: 1,266.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    950.80 : 1,319.50 = 912.40 : x
  2. Step 2: Convert to fraction form
    950.80/1,319.50 = 912.40/x
  3. Step 3: Cross multiply
    950.80x = 1,319.50 × 912.40
  4. Step 4: Simplify right side
    950.80x = 1,203,911.80
  5. Step 5: Solve for x
    x = 1,203,911.80/950.80
  6. Step 6: Final answer
    x = 1,266.21

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.