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Finding the Fourth Proportional to 391,640.50, 540,467.13 and 212,792.50

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Solution

The fourth proportional to 391,640.50, 540,467.13 and 212,792.50 is: 293,655.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,640.50 : 540,467.13 = 212,792.50 : x
  2. Step 2: Convert to fraction form
    391,640.50/540,467.13 = 212,792.50/x
  3. Step 3: Cross multiply
    391,640.50x = 540,467.13 × 212,792.50
  4. Step 4: Simplify right side
    391,640.50x = 115,007,351,760.53
  5. Step 5: Solve for x
    x = 115,007,351,760.53/391,640.50
  6. Step 6: Final answer
    x = 293,655.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.