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Finding the Fourth Proportional to 209,990.70, 315,314.10 and 121,417.20

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Solution

The fourth proportional to 209,990.70, 315,314.10 and 121,417.20 is: 182,315.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,990.70 : 315,314.10 = 121,417.20 : x
  2. Step 2: Convert to fraction form
    209,990.70/315,314.10 = 121,417.20/x
  3. Step 3: Cross multiply
    209,990.70x = 315,314.10 × 121,417.20
  4. Step 4: Simplify right side
    209,990.70x = 38,284,555,142.52
  5. Step 5: Solve for x
    x = 38,284,555,142.52/209,990.70
  6. Step 6: Final answer
    x = 182,315.48

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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.