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Finding the Fourth Proportional to 948.20, 1,421.76 and 461.12

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Solution

The fourth proportional to 948.20, 1,421.76 and 461.12 is: 691.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.20 : 1,421.76 = 461.12 : x
  2. Step 2: Convert to fraction form
    948.20/1,421.76 = 461.12/x
  3. Step 3: Cross multiply
    948.20x = 1,421.76 × 461.12
  4. Step 4: Simplify right side
    948.20x = 655,601.97
  5. Step 5: Solve for x
    x = 655,601.97/948.20
  6. Step 6: Final answer
    x = 691.42

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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.