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Finding the Fourth Proportional to 67,939.40, 101,909.10 and 21,192.20

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Solution

The fourth proportional to 67,939.40, 101,909.10 and 21,192.20 is: 31,788.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,939.40 : 101,909.10 = 21,192.20 : x
  2. Step 2: Convert to fraction form
    67,939.40/101,909.10 = 21,192.20/x
  3. Step 3: Cross multiply
    67,939.40x = 101,909.10 × 21,192.20
  4. Step 4: Simplify right side
    67,939.40x = 2,159,678,029.02
  5. Step 5: Solve for x
    x = 2,159,678,029.02/67,939.40
  6. Step 6: Final answer
    x = 31,788.30

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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.