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Finding the Fourth Proportional to 172.41, 258.75 and 90.06

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Solution

The fourth proportional to 172.41, 258.75 and 90.06 is: 135.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.41 : 258.75 = 90.06 : x
  2. Step 2: Convert to fraction form
    172.41/258.75 = 90.06/x
  3. Step 3: Cross multiply
    172.41x = 258.75 × 90.06
  4. Step 4: Simplify right side
    172.41x = 23,303.03
  5. Step 5: Solve for x
    x = 23,303.03/172.41
  6. Step 6: Final answer
    x = 135.16

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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.