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Finding the Fourth Proportional to 974.58, 1,344.87 and 680.28

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Solution

The fourth proportional to 974.58, 1,344.87 and 680.28 is: 938.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.58 : 1,344.87 = 680.28 : x
  2. Step 2: Convert to fraction form
    974.58/1,344.87 = 680.28/x
  3. Step 3: Cross multiply
    974.58x = 1,344.87 × 680.28
  4. Step 4: Simplify right side
    974.58x = 914,888.16
  5. Step 5: Solve for x
    x = 914,888.16/974.58
  6. Step 6: Final answer
    x = 938.75

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1.5x scale

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.