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Finding the Fourth Proportional to 60,085.46, 90,121.70 and 20,099.91

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Solution

The fourth proportional to 60,085.46, 90,121.70 and 20,099.91 is: 30,147.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,085.46 : 90,121.70 = 20,099.91 : x
  2. Step 2: Convert to fraction form
    60,085.46/90,121.70 = 20,099.91/x
  3. Step 3: Cross multiply
    60,085.46x = 90,121.70 × 20,099.91
  4. Step 4: Simplify right side
    60,085.46x = 1,811,437,958.55
  5. Step 5: Solve for x
    x = 1,811,437,958.55/60,085.46
  6. Step 6: Final answer
    x = 30,147.69

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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.