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Finding the Fourth Proportional to 638.40, 962.58 and 560.94

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Solution

The fourth proportional to 638.40, 962.58 and 560.94 is: 845.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.40 : 962.58 = 560.94 : x
  2. Step 2: Convert to fraction form
    638.40/962.58 = 560.94/x
  3. Step 3: Cross multiply
    638.40x = 962.58 × 560.94
  4. Step 4: Simplify right side
    638.40x = 539,949.63
  5. Step 5: Solve for x
    x = 539,949.63/638.40
  6. Step 6: Final answer
    x = 845.79

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.