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Finding the Fourth Proportional to 1,012.12, 1,397.18 and 680.76

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Solution

The fourth proportional to 1,012.12, 1,397.18 and 680.76 is: 939.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.12 : 1,397.18 = 680.76 : x
  2. Step 2: Convert to fraction form
    1,012.12/1,397.18 = 680.76/x
  3. Step 3: Cross multiply
    1,012.12x = 1,397.18 × 680.76
  4. Step 4: Simplify right side
    1,012.12x = 951,144.26
  5. Step 5: Solve for x
    x = 951,144.26/1,012.12
  6. Step 6: Final answer
    x = 939.75

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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.