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Finding the Fourth Proportional to 67,991.40, 101,987.10 and 18,079.20

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Solution

The fourth proportional to 67,991.40, 101,987.10 and 18,079.20 is: 27,118.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,991.40 : 101,987.10 = 18,079.20 : x
  2. Step 2: Convert to fraction form
    67,991.40/101,987.10 = 18,079.20/x
  3. Step 3: Cross multiply
    67,991.40x = 101,987.10 × 18,079.20
  4. Step 4: Simplify right side
    67,991.40x = 1,843,845,178.32
  5. Step 5: Solve for x
    x = 1,843,845,178.32/67,991.40
  6. Step 6: Final answer
    x = 27,118.80

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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.