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Finding the Fourth Proportional to 186.48, 279.45 and 78.35

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Solution

The fourth proportional to 186.48, 279.45 and 78.35 is: 117.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.48 : 279.45 = 78.35 : x
  2. Step 2: Convert to fraction form
    186.48/279.45 = 78.35/x
  3. Step 3: Cross multiply
    186.48x = 279.45 × 78.35
  4. Step 4: Simplify right side
    186.48x = 21,893.51
  5. Step 5: Solve for x
    x = 21,893.51/186.48
  6. Step 6: Final answer
    x = 117.40

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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.