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Finding the Fourth Proportional to 172.95, 238.72 and 99.31

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Solution

The fourth proportional to 172.95, 238.72 and 99.31 is: 137.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.95 : 238.72 = 99.31 : x
  2. Step 2: Convert to fraction form
    172.95/238.72 = 99.31/x
  3. Step 3: Cross multiply
    172.95x = 238.72 × 99.31
  4. Step 4: Simplify right side
    172.95x = 23,707.28
  5. Step 5: Solve for x
    x = 23,707.28/172.95
  6. Step 6: Final answer
    x = 137.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.