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Finding the Fourth Proportional to 272.47, 408.47 and 89.76

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Solution

The fourth proportional to 272.47, 408.47 and 89.76 is: 134.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.47 : 408.47 = 89.76 : x
  2. Step 2: Convert to fraction form
    272.47/408.47 = 89.76/x
  3. Step 3: Cross multiply
    272.47x = 408.47 × 89.76
  4. Step 4: Simplify right side
    272.47x = 36,666.02
  5. Step 5: Solve for x
    x = 36,666.02/272.47
  6. Step 6: Final answer
    x = 134.57

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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.