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Finding the Fourth Proportional to 1,247.66, 1,871.49 and 478.34

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Solution

The fourth proportional to 1,247.66, 1,871.49 and 478.34 is: 717.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.66 : 1,871.49 = 478.34 : x
  2. Step 2: Convert to fraction form
    1,247.66/1,871.49 = 478.34/x
  3. Step 3: Cross multiply
    1,247.66x = 1,871.49 × 478.34
  4. Step 4: Simplify right side
    1,247.66x = 895,208.53
  5. Step 5: Solve for x
    x = 895,208.53/1,247.66
  6. Step 6: Final answer
    x = 717.51

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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.