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Finding the Fourth Proportional to 172.71, 259.16 and 99.59

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Solution

The fourth proportional to 172.71, 259.16 and 99.59 is: 149.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.71 : 259.16 = 99.59 : x
  2. Step 2: Convert to fraction form
    172.71/259.16 = 99.59/x
  3. Step 3: Cross multiply
    172.71x = 259.16 × 99.59
  4. Step 4: Simplify right side
    172.71x = 25,807.95
  5. Step 5: Solve for x
    x = 25,807.95/172.71
  6. Step 6: Final answer
    x = 149.43

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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.