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Finding the Fourth Proportional to 393,449.64, 542,944.56 and 221,371.08

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Solution

The fourth proportional to 393,449.64, 542,944.56 and 221,371.08 is: 305,483.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,449.64 : 542,944.56 = 221,371.08 : x
  2. Step 2: Convert to fraction form
    393,449.64/542,944.56 = 221,371.08/x
  3. Step 3: Cross multiply
    393,449.64x = 542,944.56 × 221,371.08
  4. Step 4: Simplify right side
    393,449.64x = 120,192,223,627.33
  5. Step 5: Solve for x
    x = 120,192,223,627.33/393,449.64
  6. Step 6: Final answer
    x = 305,483.12

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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.