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Finding the Fourth Proportional to 7,221.92, 9,966.72 and 4,078.16

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Solution

The fourth proportional to 7,221.92, 9,966.72 and 4,078.16 is: 5,628.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.92 : 9,966.72 = 4,078.16 : x
  2. Step 2: Convert to fraction form
    7,221.92/9,966.72 = 4,078.16/x
  3. Step 3: Cross multiply
    7,221.92x = 9,966.72 × 4,078.16
  4. Step 4: Simplify right side
    7,221.92x = 40,645,878.84
  5. Step 5: Solve for x
    x = 40,645,878.84/7,221.92
  6. Step 6: Final answer
    x = 5,628.13

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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.