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Finding the Fourth Proportional to 187.90, 259.30 and 105.00

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Solution

The fourth proportional to 187.90, 259.30 and 105.00 is: 144.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.90 : 259.30 = 105.00 : x
  2. Step 2: Convert to fraction form
    187.90/259.30 = 105.00/x
  3. Step 3: Cross multiply
    187.90x = 259.30 × 105.00
  4. Step 4: Simplify right side
    187.90x = 27,224.94
  5. Step 5: Solve for x
    x = 27,224.94/187.90
  6. Step 6: Final answer
    x = 144.89

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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.