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Finding the Fourth Proportional to 86,554, 129,831 and 20,890

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Solution

The fourth proportional to 86,554, 129,831 and 20,890 is: 31,335

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,554 : 129,831 = 20,890 : x
  2. Step 2: Convert to fraction form
    86,554/129,831 = 20,890/x
  3. Step 3: Cross multiply
    86,554x = 129,831 × 20,890
  4. Step 4: Simplify right side
    86,554x = 2,712,169,590
  5. Step 5: Solve for x
    x = 2,712,169,590/86,554
  6. Step 6: Final answer
    x = 31,335

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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.