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Finding the Fourth Proportional to 1,217.27, 1,679.74 and 686.12

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Solution

The fourth proportional to 1,217.27, 1,679.74 and 686.12 is: 946.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.27 : 1,679.74 = 686.12 : x
  2. Step 2: Convert to fraction form
    1,217.27/1,679.74 = 686.12/x
  3. Step 3: Cross multiply
    1,217.27x = 1,679.74 × 686.12
  4. Step 4: Simplify right side
    1,217.27x = 1,152,502.54
  5. Step 5: Solve for x
    x = 1,152,502.54/1,217.27
  6. Step 6: Final answer
    x = 946.80

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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.