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Finding the Fourth Proportional to 974.64, 1,345.19 and 679.73

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Solution

The fourth proportional to 974.64, 1,345.19 and 679.73 is: 938.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.64 : 1,345.19 = 679.73 : x
  2. Step 2: Convert to fraction form
    974.64/1,345.19 = 679.73/x
  3. Step 3: Cross multiply
    974.64x = 1,345.19 × 679.73
  4. Step 4: Simplify right side
    974.64x = 914,362.60
  5. Step 5: Solve for x
    x = 914,362.60/974.64
  6. Step 6: Final answer
    x = 938.15

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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.