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Finding the Fourth Proportional to 7,221.76, 9,966.95 and 4,078.55

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Solution

The fourth proportional to 7,221.76, 9,966.95 and 4,078.55 is: 5,628.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.76 : 9,966.95 = 4,078.55 : x
  2. Step 2: Convert to fraction form
    7,221.76/9,966.95 = 4,078.55/x
  3. Step 3: Cross multiply
    7,221.76x = 9,966.95 × 4,078.55
  4. Step 4: Simplify right side
    7,221.76x = 40,650,723.74
  5. Step 5: Solve for x
    x = 40,650,723.74/7,221.76
  6. Step 6: Final answer
    x = 5,628.92

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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.