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Finding the Fourth Proportional to 109,871.70, 164,807.55 and 81,987.45

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Solution

The fourth proportional to 109,871.70, 164,807.55 and 81,987.45 is: 122,981.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,871.70 : 164,807.55 = 81,987.45 : x
  2. Step 2: Convert to fraction form
    109,871.70/164,807.55 = 81,987.45/x
  3. Step 3: Cross multiply
    109,871.70x = 164,807.55 × 81,987.45
  4. Step 4: Simplify right side
    109,871.70x = 13,512,150,765.25
  5. Step 5: Solve for x
    x = 13,512,150,765.25/109,871.70
  6. Step 6: Final answer
    x = 122,981.18

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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.