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Finding the Fourth Proportional to 478.21, 716.38 and 272.15

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Solution

The fourth proportional to 478.21, 716.38 and 272.15 is: 407.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.21 : 716.38 = 272.15 : x
  2. Step 2: Convert to fraction form
    478.21/716.38 = 272.15/x
  3. Step 3: Cross multiply
    478.21x = 716.38 × 272.15
  4. Step 4: Simplify right side
    478.21x = 194,962.82
  5. Step 5: Solve for x
    x = 194,962.82/478.21
  6. Step 6: Final answer
    x = 407.69

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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.