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Finding the Fourth Proportional to 5,638.32, 7,781.81 and 3,868.47

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Solution

The fourth proportional to 5,638.32, 7,781.81 and 3,868.47 is: 5,339.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.32 : 7,781.81 = 3,868.47 : x
  2. Step 2: Convert to fraction form
    5,638.32/7,781.81 = 3,868.47/x
  3. Step 3: Cross multiply
    5,638.32x = 7,781.81 × 3,868.47
  4. Step 4: Simplify right side
    5,638.32x = 30,103,679.19
  5. Step 5: Solve for x
    x = 30,103,679.19/5,638.32
  6. Step 6: Final answer
    x = 5,339.12

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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.