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Finding the Fourth Proportional to 172.59, 258.88 and 75.10

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Solution

The fourth proportional to 172.59, 258.88 and 75.10 is: 112.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.59 : 258.88 = 75.10 : x
  2. Step 2: Convert to fraction form
    172.59/258.88 = 75.10/x
  3. Step 3: Cross multiply
    172.59x = 258.88 × 75.10
  4. Step 4: Simplify right side
    172.59x = 19,440.59
  5. Step 5: Solve for x
    x = 19,440.59/172.59
  6. Step 6: Final answer
    x = 112.64

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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.