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Finding the Fourth Proportional to 974.48, 1,343.88 and 642.76

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Solution

The fourth proportional to 974.48, 1,343.88 and 642.76 is: 886.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.48 : 1,343.88 = 642.76 : x
  2. Step 2: Convert to fraction form
    974.48/1,343.88 = 642.76/x
  3. Step 3: Cross multiply
    974.48x = 1,343.88 × 642.76
  4. Step 4: Simplify right side
    974.48x = 863,792.31
  5. Step 5: Solve for x
    x = 863,792.31/974.48
  6. Step 6: Final answer
    x = 886.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.