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Finding the Fourth Proportional to 281,078.65, 421,647.51 and 91,553.79

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Solution

The fourth proportional to 281,078.65, 421,647.51 and 91,553.79 is: 137,340.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,078.65 : 421,647.51 = 91,553.79 : x
  2. Step 2: Convert to fraction form
    281,078.65/421,647.51 = 91,553.79/x
  3. Step 3: Cross multiply
    281,078.65x = 421,647.51 × 91,553.79
  4. Step 4: Simplify right side
    281,078.65x = 38,603,429,509.07
  5. Step 5: Solve for x
    x = 38,603,429,509.07/281,078.65
  6. Step 6: Final answer
    x = 137,340.31

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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.