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Finding the Fourth Proportional to 7,169.28, 9,870.72 and 6,117.12

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Solution

The fourth proportional to 7,169.28, 9,870.72 and 6,117.12 is: 8,422.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,169.28 : 9,870.72 = 6,117.12 : x
  2. Step 2: Convert to fraction form
    7,169.28/9,870.72 = 6,117.12/x
  3. Step 3: Cross multiply
    7,169.28x = 9,870.72 × 6,117.12
  4. Step 4: Simplify right side
    7,169.28x = 60,380,378.73
  5. Step 5: Solve for x
    x = 60,380,378.73/7,169.28
  6. Step 6: Final answer
    x = 8,422.10

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Double scale
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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.