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Finding the Fourth Proportional to 209,990.20, 314,903.40 and 91,580.80

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Solution

The fourth proportional to 209,990.20, 314,903.40 and 91,580.80 is: 137,335.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,990.20 : 314,903.40 = 91,580.80 : x
  2. Step 2: Convert to fraction form
    209,990.20/314,903.40 = 91,580.80/x
  3. Step 3: Cross multiply
    209,990.20x = 314,903.40 × 91,580.80
  4. Step 4: Simplify right side
    209,990.20x = 28,839,105,294.72
  5. Step 5: Solve for x
    x = 28,839,105,294.72/209,990.20
  6. Step 6: Final answer
    x = 137,335.48

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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.