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Finding the Fourth Proportional to 3,381.32, 5,071.97 and 916.20

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Solution

The fourth proportional to 3,381.32, 5,071.97 and 916.20 is: 1,374.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,381.32 : 5,071.97 = 916.20 : x
  2. Step 2: Convert to fraction form
    3,381.32/5,071.97 = 916.20/x
  3. Step 3: Cross multiply
    3,381.32x = 5,071.97 × 916.20
  4. Step 4: Simplify right side
    3,381.32x = 4,646,934.33
  5. Step 5: Solve for x
    x = 4,646,934.33/3,381.32
  6. Step 6: Final answer
    x = 1,374.30

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1.5x scale

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.