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Finding the Fourth Proportional to 391,143.70, 548,388.50 and 391,143.70

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Solution

The fourth proportional to 391,143.70, 548,388.50 and 391,143.70 is: 548,388.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,143.70 : 548,388.50 = 391,143.70 : x
  2. Step 2: Convert to fraction form
    391,143.70/548,388.50 = 391,143.70/x
  3. Step 3: Cross multiply
    391,143.70x = 548,388.50 × 391,143.70
  4. Step 4: Simplify right side
    391,143.70x = 214,498,706,927.45
  5. Step 5: Solve for x
    x = 214,498,706,927.45/391,143.70
  6. Step 6: Final answer
    x = 548,388.50

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.