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Finding the Fourth Proportional to 315,419.20, 472,351.20 and 209,665.60

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Solution

The fourth proportional to 315,419.20, 472,351.20 and 209,665.60 is: 313,981.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,419.20 : 472,351.20 = 209,665.60 : x
  2. Step 2: Convert to fraction form
    315,419.20/472,351.20 = 209,665.60/x
  3. Step 3: Cross multiply
    315,419.20x = 472,351.20 × 209,665.60
  4. Step 4: Simplify right side
    315,419.20x = 99,035,797,758.72
  5. Step 5: Solve for x
    x = 99,035,797,758.72/315,419.20
  6. Step 6: Final answer
    x = 313,981.51

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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.