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Finding the Fourth Proportional to 2,686.92, 4,030.90 and 931.86

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Solution

The fourth proportional to 2,686.92, 4,030.90 and 931.86 is: 1,397.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,686.92 : 4,030.90 = 931.86 : x
  2. Step 2: Convert to fraction form
    2,686.92/4,030.90 = 931.86/x
  3. Step 3: Cross multiply
    2,686.92x = 4,030.90 × 931.86
  4. Step 4: Simplify right side
    2,686.92x = 3,756,209.66
  5. Step 5: Solve for x
    x = 3,756,209.66/2,686.92
  6. Step 6: Final answer
    x = 1,397.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.