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Finding the Fourth Proportional to 281,003.65, 387,790.70 and 153,687.43

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Solution

The fourth proportional to 281,003.65, 387,790.70 and 153,687.43 is: 212,091.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,003.65 : 387,790.70 = 153,687.43 : x
  2. Step 2: Convert to fraction form
    281,003.65/387,790.70 = 153,687.43/x
  3. Step 3: Cross multiply
    281,003.65x = 387,790.70 × 153,687.43
  4. Step 4: Simplify right side
    281,003.65x = 59,598,556,060.90
  5. Step 5: Solve for x
    x = 59,598,556,060.90/281,003.65
  6. Step 6: Final answer
    x = 212,091.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.