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Finding the Fourth Proportional to 20,738.80, 31,108.20 and 9,074.80

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Solution

The fourth proportional to 20,738.80, 31,108.20 and 9,074.80 is: 13,612.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,738.80 : 31,108.20 = 9,074.80 : x
  2. Step 2: Convert to fraction form
    20,738.80/31,108.20 = 9,074.80/x
  3. Step 3: Cross multiply
    20,738.80x = 31,108.20 × 9,074.80
  4. Step 4: Simplify right side
    20,738.80x = 282,300,693.36
  5. Step 5: Solve for x
    x = 282,300,693.36/20,738.80
  6. Step 6: Final answer
    x = 13,612.20

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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.