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Finding the Fourth Proportional to 712.20, 981.54 and 702.12

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Solution

The fourth proportional to 712.20, 981.54 and 702.12 is: 967.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.20 : 981.54 = 702.12 : x
  2. Step 2: Convert to fraction form
    712.20/981.54 = 702.12/x
  3. Step 3: Cross multiply
    712.20x = 981.54 × 702.12
  4. Step 4: Simplify right side
    712.20x = 689,158.86
  5. Step 5: Solve for x
    x = 689,158.86/712.20
  6. Step 6: Final answer
    x = 967.65

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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.