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Finding the Fourth Proportional to 7,281.20, 10,921.80 and 3,123.20

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Solution

The fourth proportional to 7,281.20, 10,921.80 and 3,123.20 is: 4,684.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,281.20 : 10,921.80 = 3,123.20 : x
  2. Step 2: Convert to fraction form
    7,281.20/10,921.80 = 3,123.20/x
  3. Step 3: Cross multiply
    7,281.20x = 10,921.80 × 3,123.20
  4. Step 4: Simplify right side
    7,281.20x = 34,110,965.76
  5. Step 5: Solve for x
    x = 34,110,965.76/7,281.20
  6. Step 6: Final answer
    x = 4,684.80

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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.