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Finding the Fourth Proportional to 90,105.40, 134,720.70 and 66,485.80

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Solution

The fourth proportional to 90,105.40, 134,720.70 and 66,485.80 is: 99,405.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,105.40 : 134,720.70 = 66,485.80 : x
  2. Step 2: Convert to fraction form
    90,105.40/134,720.70 = 66,485.80/x
  3. Step 3: Cross multiply
    90,105.40x = 134,720.70 × 66,485.80
  4. Step 4: Simplify right side
    90,105.40x = 8,957,013,516.06
  5. Step 5: Solve for x
    x = 8,957,013,516.06/90,105.40
  6. Step 6: Final answer
    x = 99,405.96

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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.