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Finding the Fourth Proportional to 20,362.40, 30,532.80 and 7,215.20

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Solution

The fourth proportional to 20,362.40, 30,532.80 and 7,215.20 is: 10,818.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,362.40 : 30,532.80 = 7,215.20 : x
  2. Step 2: Convert to fraction form
    20,362.40/30,532.80 = 7,215.20/x
  3. Step 3: Cross multiply
    20,362.40x = 30,532.80 × 7,215.20
  4. Step 4: Simplify right side
    20,362.40x = 220,300,258.56
  5. Step 5: Solve for x
    x = 220,300,258.56/20,362.40
  6. Step 6: Final answer
    x = 10,818.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.