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Finding the Fourth Proportional to 1,247.66, 1,871.64 and 467.78

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Solution

The fourth proportional to 1,247.66, 1,871.64 and 467.78 is: 701.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.66 : 1,871.64 = 467.78 : x
  2. Step 2: Convert to fraction form
    1,247.66/1,871.64 = 467.78/x
  3. Step 3: Cross multiply
    1,247.66x = 1,871.64 × 467.78
  4. Step 4: Simplify right side
    1,247.66x = 875,515.76
  5. Step 5: Solve for x
    x = 875,515.76/1,247.66
  6. Step 6: Final answer
    x = 701.73

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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.