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Finding the Fourth Proportional to 7,230.60, 9,978.18 and 4,086.78

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Solution

The fourth proportional to 7,230.60, 9,978.18 and 4,086.78 is: 5,639.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,230.60 : 9,978.18 = 4,086.78 : x
  2. Step 2: Convert to fraction form
    7,230.60/9,978.18 = 4,086.78/x
  3. Step 3: Cross multiply
    7,230.60x = 9,978.18 × 4,086.78
  4. Step 4: Simplify right side
    7,230.60x = 40,778,626.46
  5. Step 5: Solve for x
    x = 40,778,626.46/7,230.60
  6. Step 6: Final answer
    x = 5,639.73

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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.