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Finding the Fourth Proportional to 398,993, 550,621.86 and 220,156.52

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Solution

The fourth proportional to 398,993, 550,621.86 and 220,156.52 is: 303,822.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,993 : 550,621.86 = 220,156.52 : x
  2. Step 2: Convert to fraction form
    398,993/550,621.86 = 220,156.52/x
  3. Step 3: Cross multiply
    398,993x = 550,621.86 × 220,156.52
  4. Step 4: Simplify right side
    398,993x = 121,222,992,533.53
  5. Step 5: Solve for x
    x = 121,222,992,533.53/398,993
  6. Step 6: Final answer
    x = 303,822.35

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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.