Home / 7,885.20-11,827.80-3,989.10

Finding the Fourth Proportional to 7,885.20, 11,827.80 and 3,989.10

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Solution

The fourth proportional to 7,885.20, 11,827.80 and 3,989.10 is: 5,983.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,885.20 : 11,827.80 = 3,989.10 : x
  2. Step 2: Convert to fraction form
    7,885.20/11,827.80 = 3,989.10/x
  3. Step 3: Cross multiply
    7,885.20x = 11,827.80 × 3,989.10
  4. Step 4: Simplify right side
    7,885.20x = 47,182,276.98
  5. Step 5: Solve for x
    x = 47,182,276.98/7,885.20
  6. Step 6: Final answer
    x = 5,983.65

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Double scale
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Similar ratio
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1.5x scale

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.