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Finding the Fourth Proportional to 13,781.70, 20,672.55 and 10,501.20

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Solution

The fourth proportional to 13,781.70, 20,672.55 and 10,501.20 is: 15,751.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.70 : 20,672.55 = 10,501.20 : x
  2. Step 2: Convert to fraction form
    13,781.70/20,672.55 = 10,501.20/x
  3. Step 3: Cross multiply
    13,781.70x = 20,672.55 × 10,501.20
  4. Step 4: Simplify right side
    13,781.70x = 217,086,582.06
  5. Step 5: Solve for x
    x = 217,086,582.06/13,781.70
  6. Step 6: Final answer
    x = 15,751.80

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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.