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Finding the Fourth Proportional to 90,662.40, 135,928.80 and 40,701.60

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Solution

The fourth proportional to 90,662.40, 135,928.80 and 40,701.60 is: 61,023.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,662.40 : 135,928.80 = 40,701.60 : x
  2. Step 2: Convert to fraction form
    90,662.40/135,928.80 = 40,701.60/x
  3. Step 3: Cross multiply
    90,662.40x = 135,928.80 × 40,701.60
  4. Step 4: Simplify right side
    90,662.40x = 5,532,519,646.08
  5. Step 5: Solve for x
    x = 5,532,519,646.08/90,662.40
  6. Step 6: Final answer
    x = 61,023.31

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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.