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Finding the Fourth Proportional to 391,029.02, 539,631.42 and 221,259.50

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Solution

The fourth proportional to 391,029.02, 539,631.42 and 221,259.50 is: 305,344.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,029.02 : 539,631.42 = 221,259.50 : x
  2. Step 2: Convert to fraction form
    391,029.02/539,631.42 = 221,259.50/x
  3. Step 3: Cross multiply
    391,029.02x = 539,631.42 × 221,259.50
  4. Step 4: Simplify right side
    391,029.02x = 119,398,578,173.49
  5. Step 5: Solve for x
    x = 119,398,578,173.49/391,029.02
  6. Step 6: Final answer
    x = 305,344.54

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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.