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Finding the Fourth Proportional to 6,648.60, 9,964.80 and 4,915.20

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Solution

The fourth proportional to 6,648.60, 9,964.80 and 4,915.20 is: 7,366.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,648.60 : 9,964.80 = 4,915.20 : x
  2. Step 2: Convert to fraction form
    6,648.60/9,964.80 = 4,915.20/x
  3. Step 3: Cross multiply
    6,648.60x = 9,964.80 × 4,915.20
  4. Step 4: Simplify right side
    6,648.60x = 48,978,984.96
  5. Step 5: Solve for x
    x = 48,978,984.96/6,648.60
  6. Step 6: Final answer
    x = 7,366.81

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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.