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Finding the Fourth Proportional to 686.70, 947.07 and 512.46

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Solution

The fourth proportional to 686.70, 947.07 and 512.46 is: 706.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.70 : 947.07 = 512.46 : x
  2. Step 2: Convert to fraction form
    686.70/947.07 = 512.46/x
  3. Step 3: Cross multiply
    686.70x = 947.07 × 512.46
  4. Step 4: Simplify right side
    686.70x = 485,335.49
  5. Step 5: Solve for x
    x = 485,335.49/686.70
  6. Step 6: Final answer
    x = 706.76

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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.