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Finding the Fourth Proportional to 8,913.92, 12,276.12 and 8,720.16

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Solution

The fourth proportional to 8,913.92, 12,276.12 and 8,720.16 is: 12,009.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,913.92 : 12,276.12 = 8,720.16 : x
  2. Step 2: Convert to fraction form
    8,913.92/12,276.12 = 8,720.16/x
  3. Step 3: Cross multiply
    8,913.92x = 12,276.12 × 8,720.16
  4. Step 4: Simplify right side
    8,913.92x = 107,049,730.58
  5. Step 5: Solve for x
    x = 107,049,730.58/8,913.92
  6. Step 6: Final answer
    x = 12,009.28

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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.