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Finding the Fourth Proportional to 1,247.38, 1,871.12 and 425.66

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Solution

The fourth proportional to 1,247.38, 1,871.12 and 425.66 is: 638.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.38 : 1,871.12 = 425.66 : x
  2. Step 2: Convert to fraction form
    1,247.38/1,871.12 = 425.66/x
  3. Step 3: Cross multiply
    1,247.38x = 1,871.12 × 425.66
  4. Step 4: Simplify right side
    1,247.38x = 796,449.46
  5. Step 5: Solve for x
    x = 796,449.46/1,247.38
  6. Step 6: Final answer
    x = 638.50

Related Problems

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Double scale
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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.