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Finding the Fourth Proportional to 486,540.78, 729,809.40 and 131,554.78

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Solution

The fourth proportional to 486,540.78, 729,809.40 and 131,554.78 is: 197,331.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,540.78 : 729,809.40 = 131,554.78 : x
  2. Step 2: Convert to fraction form
    486,540.78/729,809.40 = 131,554.78/x
  3. Step 3: Cross multiply
    486,540.78x = 729,809.40 × 131,554.78
  4. Step 4: Simplify right side
    486,540.78x = 96,009,915,058.93
  5. Step 5: Solve for x
    x = 96,009,915,058.93/486,540.78
  6. Step 6: Final answer
    x = 197,331.69

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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.