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Finding the Fourth Proportional to 187.88, 259.47 and 129.02

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Solution

The fourth proportional to 187.88, 259.47 and 129.02 is: 178.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.88 : 259.47 = 129.02 : x
  2. Step 2: Convert to fraction form
    187.88/259.47 = 129.02/x
  3. Step 3: Cross multiply
    187.88x = 259.47 × 129.02
  4. Step 4: Simplify right side
    187.88x = 33,476.52
  5. Step 5: Solve for x
    x = 33,476.52/187.88
  6. Step 6: Final answer
    x = 178.18

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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.