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Finding the Fourth Proportional to 7,293.20, 10,939.80 and 6,861.20

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Solution

The fourth proportional to 7,293.20, 10,939.80 and 6,861.20 is: 10,291.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,293.20 : 10,939.80 = 6,861.20 : x
  2. Step 2: Convert to fraction form
    7,293.20/10,939.80 = 6,861.20/x
  3. Step 3: Cross multiply
    7,293.20x = 10,939.80 × 6,861.20
  4. Step 4: Simplify right side
    7,293.20x = 75,060,155.76
  5. Step 5: Solve for x
    x = 75,060,155.76/7,293.20
  6. Step 6: Final answer
    x = 10,291.80

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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.