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Finding the Fourth Proportional to 391,485, 540,249.84 and 212,637

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Solution

The fourth proportional to 391,485, 540,249.84 and 212,637 is: 293,439.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,485 : 540,249.84 = 212,637 : x
  2. Step 2: Convert to fraction form
    391,485/540,249.84 = 212,637/x
  3. Step 3: Cross multiply
    391,485x = 540,249.84 × 212,637
  4. Step 4: Simplify right side
    391,485x = 114,877,105,228.08
  5. Step 5: Solve for x
    x = 114,877,105,228.08/391,485
  6. Step 6: Final answer
    x = 293,439.35

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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.