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Finding the Fourth Proportional to 281,058.90, 421,655.91 and 81,393.09

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Solution

The fourth proportional to 281,058.90, 421,655.91 and 81,393.09 is: 122,109.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,058.90 : 421,655.91 = 81,393.09 : x
  2. Step 2: Convert to fraction form
    281,058.90/421,655.91 = 81,393.09/x
  3. Step 3: Cross multiply
    281,058.90x = 421,655.91 × 81,393.09
  4. Step 4: Simplify right side
    281,058.90x = 34,319,877,431.66
  5. Step 5: Solve for x
    x = 34,319,877,431.66/281,058.90
  6. Step 6: Final answer
    x = 122,109.20

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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.