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Finding the Fourth Proportional to 315,319.36, 472,568.32 and 128,112

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Solution

The fourth proportional to 315,319.36, 472,568.32 and 128,112 is: 192,001.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,319.36 : 472,568.32 = 128,112 : x
  2. Step 2: Convert to fraction form
    315,319.36/472,568.32 = 128,112/x
  3. Step 3: Cross multiply
    315,319.36x = 472,568.32 × 128,112
  4. Step 4: Simplify right side
    315,319.36x = 60,541,672,611.84
  5. Step 5: Solve for x
    x = 60,541,672,611.84/315,319.36
  6. Step 6: Final answer
    x = 192,001.13

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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.