Home / 281,138.68-421,708.02-81,459.20

Finding the Fourth Proportional to 281,138.68, 421,708.02 and 81,459.20

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Solution

The fourth proportional to 281,138.68, 421,708.02 and 81,459.20 is: 122,188.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,138.68 : 421,708.02 = 81,459.20 : x
  2. Step 2: Convert to fraction form
    281,138.68/421,708.02 = 81,459.20/x
  3. Step 3: Cross multiply
    281,138.68x = 421,708.02 × 81,459.20
  4. Step 4: Simplify right side
    281,138.68x = 34,351,997,942.78
  5. Step 5: Solve for x
    x = 34,351,997,942.78/281,138.68
  6. Step 6: Final answer
    x = 122,188.80

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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.