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Finding the Fourth Proportional to 7,221.60, 10,901.70 and 7,148.70

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Solution

The fourth proportional to 7,221.60, 10,901.70 and 7,148.70 is: 10,791.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.60 : 10,901.70 = 7,148.70 : x
  2. Step 2: Convert to fraction form
    7,221.60/10,901.70 = 7,148.70/x
  3. Step 3: Cross multiply
    7,221.60x = 10,901.70 × 7,148.70
  4. Step 4: Simplify right side
    7,221.60x = 77,932,982.79
  5. Step 5: Solve for x
    x = 77,932,982.79/7,221.60
  6. Step 6: Final answer
    x = 10,791.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.