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Finding the Fourth Proportional to 3,953.60, 5,930.40 and 3,915.20

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Solution

The fourth proportional to 3,953.60, 5,930.40 and 3,915.20 is: 5,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,953.60 : 5,930.40 = 3,915.20 : x
  2. Step 2: Convert to fraction form
    3,953.60/5,930.40 = 3,915.20/x
  3. Step 3: Cross multiply
    3,953.60x = 5,930.40 × 3,915.20
  4. Step 4: Simplify right side
    3,953.60x = 23,218,702.08
  5. Step 5: Solve for x
    x = 23,218,702.08/3,953.60
  6. Step 6: Final answer
    x = 5,872.80

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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.