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Finding the Fourth Proportional to 186.32, 279.30 and 78.20

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Solution

The fourth proportional to 186.32, 279.30 and 78.20 is: 117.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.32 : 279.30 = 78.20 : x
  2. Step 2: Convert to fraction form
    186.32/279.30 = 78.20/x
  3. Step 3: Cross multiply
    186.32x = 279.30 × 78.20
  4. Step 4: Simplify right side
    186.32x = 21,841.26
  5. Step 5: Solve for x
    x = 21,841.26/186.32
  6. Step 6: Final answer
    x = 117.22

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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.