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Finding the Fourth Proportional to 3,381.60, 5,072.40 and 3,122.40

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Solution

The fourth proportional to 3,381.60, 5,072.40 and 3,122.40 is: 4,683.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,381.60 : 5,072.40 = 3,122.40 : x
  2. Step 2: Convert to fraction form
    3,381.60/5,072.40 = 3,122.40/x
  3. Step 3: Cross multiply
    3,381.60x = 5,072.40 × 3,122.40
  4. Step 4: Simplify right side
    3,381.60x = 15,838,061.76
  5. Step 5: Solve for x
    x = 15,838,061.76/3,381.60
  6. Step 6: Final answer
    x = 4,683.60

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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.