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Finding the Fourth Proportional to 949.20, 1,309.80 and 576.15

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Solution

The fourth proportional to 949.20, 1,309.80 and 576.15 is: 795.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.20 : 1,309.80 = 576.15 : x
  2. Step 2: Convert to fraction form
    949.20/1,309.80 = 576.15/x
  3. Step 3: Cross multiply
    949.20x = 1,309.80 × 576.15
  4. Step 4: Simplify right side
    949.20x = 754,644.02
  5. Step 5: Solve for x
    x = 754,644.02/949.20
  6. Step 6: Final answer
    x = 795.03

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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.