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Finding the Fourth Proportional to 60,109.80, 90,170.72 and 20,661.72

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Solution

The fourth proportional to 60,109.80, 90,170.72 and 20,661.72 is: 30,994.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,109.80 : 90,170.72 = 20,661.72 : x
  2. Step 2: Convert to fraction form
    60,109.80/90,170.72 = 20,661.72/x
  3. Step 3: Cross multiply
    60,109.80x = 90,170.72 × 20,661.72
  4. Step 4: Simplify right side
    60,109.80x = 1,863,082,168.84
  5. Step 5: Solve for x
    x = 1,863,082,168.84/60,109.80
  6. Step 6: Final answer
    x = 30,994.65

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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.