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Finding the Fourth Proportional to 67,172.34, 100,754.85 and 20,421.57

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Solution

The fourth proportional to 67,172.34, 100,754.85 and 20,421.57 is: 30,631.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,172.34 : 100,754.85 = 20,421.57 : x
  2. Step 2: Convert to fraction form
    67,172.34/100,754.85 = 20,421.57/x
  3. Step 3: Cross multiply
    67,172.34x = 100,754.85 × 20,421.57
  4. Step 4: Simplify right side
    67,172.34x = 2,057,572,222.11
  5. Step 5: Solve for x
    x = 2,057,572,222.11/67,172.34
  6. Step 6: Final answer
    x = 30,631.24

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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.