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Finding the Fourth Proportional to 272.79, 409.12 and 99.45

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Solution

The fourth proportional to 272.79, 409.12 and 99.45 is: 149.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.79 : 409.12 = 99.45 : x
  2. Step 2: Convert to fraction form
    272.79/409.12 = 99.45/x
  3. Step 3: Cross multiply
    272.79x = 409.12 × 99.45
  4. Step 4: Simplify right side
    272.79x = 40,686.74
  5. Step 5: Solve for x
    x = 40,686.74/272.79
  6. Step 6: Final answer
    x = 149.15

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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.