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Finding the Fourth Proportional to 8,707.12, 12,015.76 and 4,728.20

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Solution

The fourth proportional to 8,707.12, 12,015.76 and 4,728.20 is: 6,524.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,707.12 : 12,015.76 = 4,728.20 : x
  2. Step 2: Convert to fraction form
    8,707.12/12,015.76 = 4,728.20/x
  3. Step 3: Cross multiply
    8,707.12x = 12,015.76 × 4,728.20
  4. Step 4: Simplify right side
    8,707.12x = 56,812,916.43
  5. Step 5: Solve for x
    x = 56,812,916.43/8,707.12
  6. Step 6: Final answer
    x = 6,524.88

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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.