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Finding the Fourth Proportional to 187.20, 258.10 and 145.18

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Solution

The fourth proportional to 187.20, 258.10 and 145.18 is: 200.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.20 : 258.10 = 145.18 : x
  2. Step 2: Convert to fraction form
    187.20/258.10 = 145.18/x
  3. Step 3: Cross multiply
    187.20x = 258.10 × 145.18
  4. Step 4: Simplify right side
    187.20x = 37,470.96
  5. Step 5: Solve for x
    x = 37,470.96/187.20
  6. Step 6: Final answer
    x = 200.17

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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.