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Finding the Fourth Proportional to 90,323.80, 135,485.70 and 28,000.60

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Solution

The fourth proportional to 90,323.80, 135,485.70 and 28,000.60 is: 42,000.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,323.80 : 135,485.70 = 28,000.60 : x
  2. Step 2: Convert to fraction form
    90,323.80/135,485.70 = 28,000.60/x
  3. Step 3: Cross multiply
    90,323.80x = 135,485.70 × 28,000.60
  4. Step 4: Simplify right side
    90,323.80x = 3,793,680,891.42
  5. Step 5: Solve for x
    x = 3,793,680,891.42/90,323.80
  6. Step 6: Final answer
    x = 42,000.90

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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.