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Finding the Fourth Proportional to 403.42, 556.55 and 272.20

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Solution

The fourth proportional to 403.42, 556.55 and 272.20 is: 375.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.42 : 556.55 = 272.20 : x
  2. Step 2: Convert to fraction form
    403.42/556.55 = 272.20/x
  3. Step 3: Cross multiply
    403.42x = 556.55 × 272.20
  4. Step 4: Simplify right side
    403.42x = 151,492.91
  5. Step 5: Solve for x
    x = 151,492.91/403.42
  6. Step 6: Final answer
    x = 375.52

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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.