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Finding the Fourth Proportional to 7,221.10, 10,831.65 and 7,123.90

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Solution

The fourth proportional to 7,221.10, 10,831.65 and 7,123.90 is: 10,685.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.10 : 10,831.65 = 7,123.90 : x
  2. Step 2: Convert to fraction form
    7,221.10/10,831.65 = 7,123.90/x
  3. Step 3: Cross multiply
    7,221.10x = 10,831.65 × 7,123.90
  4. Step 4: Simplify right side
    7,221.10x = 77,163,591.44
  5. Step 5: Solve for x
    x = 77,163,591.44/7,221.10
  6. Step 6: Final answer
    x = 10,685.85

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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.