Home / 109,983.80-164,975.70-81,990.20

Finding the Fourth Proportional to 109,983.80, 164,975.70 and 81,990.20

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Solution

The fourth proportional to 109,983.80, 164,975.70 and 81,990.20 is: 122,985.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,983.80 : 164,975.70 = 81,990.20 : x
  2. Step 2: Convert to fraction form
    109,983.80/164,975.70 = 81,990.20/x
  3. Step 3: Cross multiply
    109,983.80x = 164,975.70 × 81,990.20
  4. Step 4: Simplify right side
    109,983.80x = 13,526,390,638.14
  5. Step 5: Solve for x
    x = 13,526,390,638.14/109,983.80
  6. Step 6: Final answer
    x = 122,985.30

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Similar ratio
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1.5x scale

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.