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Finding the Fourth Proportional to 15,141.20, 21,219.55 and 15,141.20

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Solution

The fourth proportional to 15,141.20, 21,219.55 and 15,141.20 is: 21,219.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,141.20 : 21,219.55 = 15,141.20 : x
  2. Step 2: Convert to fraction form
    15,141.20/21,219.55 = 15,141.20/x
  3. Step 3: Cross multiply
    15,141.20x = 21,219.55 × 15,141.20
  4. Step 4: Simplify right side
    15,141.20x = 321,289,450.46
  5. Step 5: Solve for x
    x = 321,289,450.46/15,141.20
  6. Step 6: Final answer
    x = 21,219.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.