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Finding the Fourth Proportional to 67,116.72, 100,675.40 and 20,370

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Solution

The fourth proportional to 67,116.72, 100,675.40 and 20,370 is: 30,555.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,116.72 : 100,675.40 = 20,370 : x
  2. Step 2: Convert to fraction form
    67,116.72/100,675.40 = 20,370/x
  3. Step 3: Cross multiply
    67,116.72x = 100,675.40 × 20,370
  4. Step 4: Simplify right side
    67,116.72x = 2,050,757,898
  5. Step 5: Solve for x
    x = 2,050,757,898/67,116.72
  6. Step 6: Final answer
    x = 30,555.10

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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.