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Finding the Fourth Proportional to 5,672.15, 7,818.89 and 3,988.97

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Solution

The fourth proportional to 5,672.15, 7,818.89 and 3,988.97 is: 5,498.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,672.15 : 7,818.89 = 3,988.97 : x
  2. Step 2: Convert to fraction form
    5,672.15/7,818.89 = 3,988.97/x
  3. Step 3: Cross multiply
    5,672.15x = 7,818.89 × 3,988.97
  4. Step 4: Simplify right side
    5,672.15x = 31,189,317.64
  5. Step 5: Solve for x
    x = 31,189,317.64/5,672.15
  6. Step 6: Final answer
    x = 5,498.68

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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.