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Finding the Fourth Proportional to 398.76, 597.21 and 277.11

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Solution

The fourth proportional to 398.76, 597.21 and 277.11 is: 415.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.76 : 597.21 = 277.11 : x
  2. Step 2: Convert to fraction form
    398.76/597.21 = 277.11/x
  3. Step 3: Cross multiply
    398.76x = 597.21 × 277.11
  4. Step 4: Simplify right side
    398.76x = 165,492.86
  5. Step 5: Solve for x
    x = 165,492.86/398.76
  6. Step 6: Final answer
    x = 415.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.