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Finding the Fourth Proportional to 686.08, 946.74 and 391.33

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Solution

The fourth proportional to 686.08, 946.74 and 391.33 is: 540.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.08 : 946.74 = 391.33 : x
  2. Step 2: Convert to fraction form
    686.08/946.74 = 391.33/x
  3. Step 3: Cross multiply
    686.08x = 946.74 × 391.33
  4. Step 4: Simplify right side
    686.08x = 370,487.76
  5. Step 5: Solve for x
    x = 370,487.76/686.08
  6. Step 6: Final answer
    x = 540.01

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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.