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Finding the Fourth Proportional to 3,888.68, 5,361.54 and 3,139.88

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Solution

The fourth proportional to 3,888.68, 5,361.54 and 3,139.88 is: 4,329.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,888.68 : 5,361.54 = 3,139.88 : x
  2. Step 2: Convert to fraction form
    3,888.68/5,361.54 = 3,139.88/x
  3. Step 3: Cross multiply
    3,888.68x = 5,361.54 × 3,139.88
  4. Step 4: Simplify right side
    3,888.68x = 16,834,592.22
  5. Step 5: Solve for x
    x = 16,834,592.22/3,888.68
  6. Step 6: Final answer
    x = 4,329.13

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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.