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Finding the Fourth Proportional to 281,058.40, 421,655.16 and 81,392.59

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Solution

The fourth proportional to 281,058.40, 421,655.16 and 81,392.59 is: 122,108.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,058.40 : 421,655.16 = 81,392.59 : x
  2. Step 2: Convert to fraction form
    281,058.40/421,655.16 = 81,392.59/x
  3. Step 3: Cross multiply
    281,058.40x = 421,655.16 × 81,392.59
  4. Step 4: Simplify right side
    281,058.40x = 34,319,605,559.26
  5. Step 5: Solve for x
    x = 34,319,605,559.26/281,058.40
  6. Step 6: Final answer
    x = 122,108.45

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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.