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Finding the Fourth Proportional to 315,207.40, 472,811.10 and 128,122.60

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Solution

The fourth proportional to 315,207.40, 472,811.10 and 128,122.60 is: 192,183.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,207.40 : 472,811.10 = 128,122.60 : x
  2. Step 2: Convert to fraction form
    315,207.40/472,811.10 = 128,122.60/x
  3. Step 3: Cross multiply
    315,207.40x = 472,811.10 × 128,122.60
  4. Step 4: Simplify right side
    315,207.40x = 60,577,787,440.86
  5. Step 5: Solve for x
    x = 60,577,787,440.86/315,207.40
  6. Step 6: Final answer
    x = 192,183.90

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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.