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Finding the Fourth Proportional to 398,990, 550,617.72 and 220,153.52

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Solution

The fourth proportional to 398,990, 550,617.72 and 220,153.52 is: 303,818.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,990 : 550,617.72 = 220,153.52 : x
  2. Step 2: Convert to fraction form
    398,990/550,617.72 = 220,153.52/x
  3. Step 3: Cross multiply
    398,990x = 550,617.72 × 220,153.52
  4. Step 4: Simplify right side
    398,990x = 121,220,429,232.37
  5. Step 5: Solve for x
    x = 121,220,429,232.37/398,990
  6. Step 6: Final answer
    x = 303,818.21

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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.