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Finding the Fourth Proportional to 67,272.30, 100,904.79 and 20,521.50

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Solution

The fourth proportional to 67,272.30, 100,904.79 and 20,521.50 is: 30,781.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,272.30 : 100,904.79 = 20,521.50 : x
  2. Step 2: Convert to fraction form
    67,272.30/100,904.79 = 20,521.50/x
  3. Step 3: Cross multiply
    67,272.30x = 100,904.79 × 20,521.50
  4. Step 4: Simplify right side
    67,272.30x = 2,070,717,647.99
  5. Step 5: Solve for x
    x = 2,070,717,647.99/67,272.30
  6. Step 6: Final answer
    x = 30,781.13

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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.