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Finding the Fourth Proportional to 187.66, 258.48 and 172.13

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Solution

The fourth proportional to 187.66, 258.48 and 172.13 is: 237.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.66 : 258.48 = 172.13 : x
  2. Step 2: Convert to fraction form
    187.66/258.48 = 172.13/x
  3. Step 3: Cross multiply
    187.66x = 258.48 × 172.13
  4. Step 4: Simplify right side
    187.66x = 44,492.81
  5. Step 5: Solve for x
    x = 44,492.81/187.66
  6. Step 6: Final answer
    x = 237.10

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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.