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Finding the Fourth Proportional to 100,628.60, 150,942.90 and 90,606.20

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Solution

The fourth proportional to 100,628.60, 150,942.90 and 90,606.20 is: 135,909.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,628.60 : 150,942.90 = 90,606.20 : x
  2. Step 2: Convert to fraction form
    100,628.60/150,942.90 = 90,606.20/x
  3. Step 3: Cross multiply
    100,628.60x = 150,942.90 × 90,606.20
  4. Step 4: Simplify right side
    100,628.60x = 13,676,362,585.98
  5. Step 5: Solve for x
    x = 13,676,362,585.98/100,628.60
  6. Step 6: Final answer
    x = 135,909.30

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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.