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Finding the Fourth Proportional to 15,393.80, 21,243.42 and 8,320.23

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Solution

The fourth proportional to 15,393.80, 21,243.42 and 8,320.23 is: 11,481.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,393.80 : 21,243.42 = 8,320.23 : x
  2. Step 2: Convert to fraction form
    15,393.80/21,243.42 = 8,320.23/x
  3. Step 3: Cross multiply
    15,393.80x = 21,243.42 × 8,320.23
  4. Step 4: Simplify right side
    15,393.80x = 176,750,140.39
  5. Step 5: Solve for x
    x = 176,750,140.39/15,393.80
  6. Step 6: Final answer
    x = 11,481.90

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Double scale
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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.