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Finding the Fourth Proportional to 393,646.13, 543,248.96 and 221,575.22

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Solution

The fourth proportional to 393,646.13, 543,248.96 and 221,575.22 is: 305,783.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,646.13 : 543,248.96 = 221,575.22 : x
  2. Step 2: Convert to fraction form
    393,646.13/543,248.96 = 221,575.22/x
  3. Step 3: Cross multiply
    393,646.13x = 543,248.96 × 221,575.22
  4. Step 4: Simplify right side
    393,646.13x = 120,370,505,664.46
  5. Step 5: Solve for x
    x = 120,370,505,664.46/393,646.13
  6. Step 6: Final answer
    x = 305,783.53

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1.5x scale

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.