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Finding the Fourth Proportional to 90,991.80, 136,439.10 and 38,341.80

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Solution

The fourth proportional to 90,991.80, 136,439.10 and 38,341.80 is: 57,492.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,991.80 : 136,439.10 = 38,341.80 : x
  2. Step 2: Convert to fraction form
    90,991.80/136,439.10 = 38,341.80/x
  3. Step 3: Cross multiply
    90,991.80x = 136,439.10 × 38,341.80
  4. Step 4: Simplify right side
    90,991.80x = 5,231,320,684.38
  5. Step 5: Solve for x
    x = 5,231,320,684.38/90,991.80
  6. Step 6: Final answer
    x = 57,492.22

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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.