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Finding the Fourth Proportional to 1,243.80, 1,865.70 and 749.70

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Solution

The fourth proportional to 1,243.80, 1,865.70 and 749.70 is: 1,124.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.80 : 1,865.70 = 749.70 : x
  2. Step 2: Convert to fraction form
    1,243.80/1,865.70 = 749.70/x
  3. Step 3: Cross multiply
    1,243.80x = 1,865.70 × 749.70
  4. Step 4: Simplify right side
    1,243.80x = 1,398,715.29
  5. Step 5: Solve for x
    x = 1,398,715.29/1,243.80
  6. Step 6: Final answer
    x = 1,124.55

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Similar ratio
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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.