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Finding the Fourth Proportional to 12,781.80, 19,140.30 and 10,189.80

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Solution

The fourth proportional to 12,781.80, 19,140.30 and 10,189.80 is: 15,258.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,781.80 : 19,140.30 = 10,189.80 : x
  2. Step 2: Convert to fraction form
    12,781.80/19,140.30 = 10,189.80/x
  3. Step 3: Cross multiply
    12,781.80x = 19,140.30 × 10,189.80
  4. Step 4: Simplify right side
    12,781.80x = 195,035,828.94
  5. Step 5: Solve for x
    x = 195,035,828.94/12,781.80
  6. Step 6: Final answer
    x = 15,258.87

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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.