Home / 8,928.20-12,320.61-5,390.79

Finding the Fourth Proportional to 8,928.20, 12,320.61 and 5,390.79

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Solution

The fourth proportional to 8,928.20, 12,320.61 and 5,390.79 is: 7,439.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,928.20 : 12,320.61 = 5,390.79 : x
  2. Step 2: Convert to fraction form
    8,928.20/12,320.61 = 5,390.79/x
  3. Step 3: Cross multiply
    8,928.20x = 12,320.61 × 5,390.79
  4. Step 4: Simplify right side
    8,928.20x = 66,417,821.18
  5. Step 5: Solve for x
    x = 66,417,821.18/8,928.20
  6. Step 6: Final answer
    x = 7,439.11

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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.