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Finding the Fourth Proportional to 418.30, 577.30 and 243.64

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Solution

The fourth proportional to 418.30, 577.30 and 243.64 is: 336.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.30 : 577.30 = 243.64 : x
  2. Step 2: Convert to fraction form
    418.30/577.30 = 243.64/x
  3. Step 3: Cross multiply
    418.30x = 577.30 × 243.64
  4. Step 4: Simplify right side
    418.30x = 140,653.37
  5. Step 5: Solve for x
    x = 140,653.37/418.30
  6. Step 6: Final answer
    x = 336.25

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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.