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Finding the Fourth Proportional to 478.21, 716.86 and 272.89

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Solution

The fourth proportional to 478.21, 716.86 and 272.89 is: 409.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.21 : 716.86 = 272.89 : x
  2. Step 2: Convert to fraction form
    478.21/716.86 = 272.89/x
  3. Step 3: Cross multiply
    478.21x = 716.86 × 272.89
  4. Step 4: Simplify right side
    478.21x = 195,623.93
  5. Step 5: Solve for x
    x = 195,623.93/478.21
  6. Step 6: Final answer
    x = 409.08

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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.