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Finding the Fourth Proportional to 7,960.64, 10,987.68 and 5,129.92

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Solution

The fourth proportional to 7,960.64, 10,987.68 and 5,129.92 is: 7,080.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,960.64 : 10,987.68 = 5,129.92 : x
  2. Step 2: Convert to fraction form
    7,960.64/10,987.68 = 5,129.92/x
  3. Step 3: Cross multiply
    7,960.64x = 10,987.68 × 5,129.92
  4. Step 4: Simplify right side
    7,960.64x = 56,365,919.39
  5. Step 5: Solve for x
    x = 56,365,919.39/7,960.64
  6. Step 6: Final answer
    x = 7,080.58

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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.