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Finding the Fourth Proportional to 7,915.76, 10,921.98 and 4,728.20

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Solution

The fourth proportional to 7,915.76, 10,921.98 and 4,728.20 is: 6,523.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,915.76 : 10,921.98 = 4,728.20 : x
  2. Step 2: Convert to fraction form
    7,915.76/10,921.98 = 4,728.20/x
  3. Step 3: Cross multiply
    7,915.76x = 10,921.98 × 4,728.20
  4. Step 4: Simplify right side
    7,915.76x = 51,641,305.84
  5. Step 5: Solve for x
    x = 51,641,305.84/7,915.76
  6. Step 6: Final answer
    x = 6,523.86

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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.