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Finding the Fourth Proportional to 315,315.20, 472,195.20 and 209,561.60

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Solution

The fourth proportional to 315,315.20, 472,195.20 and 209,561.60 is: 313,825.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,315.20 : 472,195.20 = 209,561.60 : x
  2. Step 2: Convert to fraction form
    315,315.20/472,195.20 = 209,561.60/x
  3. Step 3: Cross multiply
    315,315.20x = 472,195.20 × 209,561.60
  4. Step 4: Simplify right side
    315,315.20x = 98,953,981,624.32
  5. Step 5: Solve for x
    x = 98,953,981,624.32/315,315.20
  6. Step 6: Final answer
    x = 313,825.60

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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.