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Finding the Fourth Proportional to 712.40, 981.72 and 694.17

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Solution

The fourth proportional to 712.40, 981.72 and 694.17 is: 956.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.40 : 981.72 = 694.17 : x
  2. Step 2: Convert to fraction form
    712.40/981.72 = 694.17/x
  3. Step 3: Cross multiply
    712.40x = 981.72 × 694.17
  4. Step 4: Simplify right side
    712.40x = 681,480.57
  5. Step 5: Solve for x
    x = 681,480.57/712.40
  6. Step 6: Final answer
    x = 956.60

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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.