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Finding the Fourth Proportional to 1,248.42, 1,871.53 and 478.38

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Solution

The fourth proportional to 1,248.42, 1,871.53 and 478.38 is: 717.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.42 : 1,871.53 = 478.38 : x
  2. Step 2: Convert to fraction form
    1,248.42/1,871.53 = 478.38/x
  3. Step 3: Cross multiply
    1,248.42x = 1,871.53 × 478.38
  4. Step 4: Simplify right side
    1,248.42x = 895,302.52
  5. Step 5: Solve for x
    x = 895,302.52/1,248.42
  6. Step 6: Final answer
    x = 717.15

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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.