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Finding the Fourth Proportional to 7,220.49, 9,960.11 and 4,347.21

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Solution

The fourth proportional to 7,220.49, 9,960.11 and 4,347.21 is: 5,996.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,220.49 : 9,960.11 = 4,347.21 : x
  2. Step 2: Convert to fraction form
    7,220.49/9,960.11 = 4,347.21/x
  3. Step 3: Cross multiply
    7,220.49x = 9,960.11 × 4,347.21
  4. Step 4: Simplify right side
    7,220.49x = 43,298,689.79
  5. Step 5: Solve for x
    x = 43,298,689.79/7,220.49
  6. Step 6: Final answer
    x = 5,996.65

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Half scale
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Double scale
Find fourth proportional to 7,221.49, 9,961.49 and 4,348.21
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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.