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Finding the Fourth Proportional to 389,956.40, 538,149.60 and 220,191.72

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Solution

The fourth proportional to 389,956.40, 538,149.60 and 220,191.72 is: 303,870.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,956.40 : 538,149.60 = 220,191.72 : x
  2. Step 2: Convert to fraction form
    389,956.40/538,149.60 = 220,191.72/x
  3. Step 3: Cross multiply
    389,956.40x = 538,149.60 × 220,191.72
  4. Step 4: Simplify right side
    389,956.40x = 118,496,086,041.31
  5. Step 5: Solve for x
    x = 118,496,086,041.31/389,956.40
  6. Step 6: Final answer
    x = 303,870.09

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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.