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Finding the Fourth Proportional to 66,812.80, 100,219.20 and 31,820.80

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Solution

The fourth proportional to 66,812.80, 100,219.20 and 31,820.80 is: 47,731.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,812.80 : 100,219.20 = 31,820.80 : x
  2. Step 2: Convert to fraction form
    66,812.80/100,219.20 = 31,820.80/x
  3. Step 3: Cross multiply
    66,812.80x = 100,219.20 × 31,820.80
  4. Step 4: Simplify right side
    66,812.80x = 3,189,055,119.36
  5. Step 5: Solve for x
    x = 3,189,055,119.36/66,812.80
  6. Step 6: Final answer
    x = 47,731.20

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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.