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Finding the Fourth Proportional to 186.60, 279.93 and 90.36

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Solution

The fourth proportional to 186.60, 279.93 and 90.36 is: 135.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.60 : 279.93 = 90.36 : x
  2. Step 2: Convert to fraction form
    186.60/279.93 = 90.36/x
  3. Step 3: Cross multiply
    186.60x = 279.93 × 90.36
  4. Step 4: Simplify right side
    186.60x = 25,294.47
  5. Step 5: Solve for x
    x = 25,294.47/186.60
  6. Step 6: Final answer
    x = 135.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.