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Finding the Fourth Proportional to 686.16, 946.94 and 391.38

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Solution

The fourth proportional to 686.16, 946.94 and 391.38 is: 540.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.16 : 946.94 = 391.38 : x
  2. Step 2: Convert to fraction form
    686.16/946.94 = 391.38/x
  3. Step 3: Cross multiply
    686.16x = 946.94 × 391.38
  4. Step 4: Simplify right side
    686.16x = 370,613.38
  5. Step 5: Solve for x
    x = 370,613.38/686.16
  6. Step 6: Final answer
    x = 540.13

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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.