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Finding the Fourth Proportional to 418.40, 577.38 and 243.74

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Solution

The fourth proportional to 418.40, 577.38 and 243.74 is: 336.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.40 : 577.38 = 243.74 : x
  2. Step 2: Convert to fraction form
    418.40/577.38 = 243.74/x
  3. Step 3: Cross multiply
    418.40x = 577.38 × 243.74
  4. Step 4: Simplify right side
    418.40x = 140,730.60
  5. Step 5: Solve for x
    x = 140,730.60/418.40
  6. Step 6: Final answer
    x = 336.35

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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.