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Finding the Fourth Proportional to 801.72, 1,107.18 and 690.57

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Solution

The fourth proportional to 801.72, 1,107.18 and 690.57 is: 953.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.72 : 1,107.18 = 690.57 : x
  2. Step 2: Convert to fraction form
    801.72/1,107.18 = 690.57/x
  3. Step 3: Cross multiply
    801.72x = 1,107.18 × 690.57
  4. Step 4: Simplify right side
    801.72x = 764,585.29
  5. Step 5: Solve for x
    x = 764,585.29/801.72
  6. Step 6: Final answer
    x = 953.68

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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.