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Finding the Fourth Proportional to 1,387.74, 2,080.85 and 949.49

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Solution

The fourth proportional to 1,387.74, 2,080.85 and 949.49 is: 1,423.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.74 : 2,080.85 = 949.49 : x
  2. Step 2: Convert to fraction form
    1,387.74/2,080.85 = 949.49/x
  3. Step 3: Cross multiply
    1,387.74x = 2,080.85 × 949.49
  4. Step 4: Simplify right side
    1,387.74x = 1,975,731.11
  5. Step 5: Solve for x
    x = 1,975,731.11/1,387.74
  6. Step 6: Final answer
    x = 1,423.70

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1.5x scale

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.