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Finding the Fourth Proportional to 1,247.75, 1,871.70 and 382.07

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Solution

The fourth proportional to 1,247.75, 1,871.70 and 382.07 is: 573.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.75 : 1,871.70 = 382.07 : x
  2. Step 2: Convert to fraction form
    1,247.75/1,871.70 = 382.07/x
  3. Step 3: Cross multiply
    1,247.75x = 1,871.70 × 382.07
  4. Step 4: Simplify right side
    1,247.75x = 715,120.42
  5. Step 5: Solve for x
    x = 715,120.42/1,247.75
  6. Step 6: Final answer
    x = 573.13

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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.