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Finding the Fourth Proportional to 7,221.95, 9,966.32 and 3,909.95

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Solution

The fourth proportional to 7,221.95, 9,966.32 and 3,909.95 is: 5,395.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.95 : 9,966.32 = 3,909.95 : x
  2. Step 2: Convert to fraction form
    7,221.95/9,966.32 = 3,909.95/x
  3. Step 3: Cross multiply
    7,221.95x = 9,966.32 × 3,909.95
  4. Step 4: Simplify right side
    7,221.95x = 38,967,743.50
  5. Step 5: Solve for x
    x = 38,967,743.50/7,221.95
  6. Step 6: Final answer
    x = 5,395.74

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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.