Home / 209,128.96-313,517.10-90,711.16

Finding the Fourth Proportional to 209,128.96, 313,517.10 and 90,711.16

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Solution

The fourth proportional to 209,128.96, 313,517.10 and 90,711.16 is: 135,990.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,128.96 : 313,517.10 = 90,711.16 : x
  2. Step 2: Convert to fraction form
    209,128.96/313,517.10 = 90,711.16/x
  3. Step 3: Cross multiply
    209,128.96x = 313,517.10 × 90,711.16
  4. Step 4: Simplify right side
    209,128.96x = 28,439,499,820.84
  5. Step 5: Solve for x
    x = 28,439,499,820.84/209,128.96
  6. Step 6: Final answer
    x = 135,990.25

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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.