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Finding the Fourth Proportional to 12,721.20, 19,060.92 and 12,235.20

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Solution

The fourth proportional to 12,721.20, 19,060.92 and 12,235.20 is: 18,332.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,721.20 : 19,060.92 = 12,235.20 : x
  2. Step 2: Convert to fraction form
    12,721.20/19,060.92 = 12,235.20/x
  3. Step 3: Cross multiply
    12,721.20x = 19,060.92 × 12,235.20
  4. Step 4: Simplify right side
    12,721.20x = 233,214,168.38
  5. Step 5: Solve for x
    x = 233,214,168.38/12,721.20
  6. Step 6: Final answer
    x = 18,332.72

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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.