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Finding the Fourth Proportional to 4,915.80, 6,787.98 and 4,172.22

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Solution

The fourth proportional to 4,915.80, 6,787.98 and 4,172.22 is: 5,761.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,915.80 : 6,787.98 = 4,172.22 : x
  2. Step 2: Convert to fraction form
    4,915.80/6,787.98 = 4,172.22/x
  3. Step 3: Cross multiply
    4,915.80x = 6,787.98 × 4,172.22
  4. Step 4: Simplify right side
    4,915.80x = 28,320,945.92
  5. Step 5: Solve for x
    x = 28,320,945.92/4,915.80
  6. Step 6: Final answer
    x = 5,761.21

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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.