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Finding the Fourth Proportional to 186.61, 279.45 and 157.90

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Solution

The fourth proportional to 186.61, 279.45 and 157.90 is: 236.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.61 : 279.45 = 157.90 : x
  2. Step 2: Convert to fraction form
    186.61/279.45 = 157.90/x
  3. Step 3: Cross multiply
    186.61x = 279.45 × 157.90
  4. Step 4: Simplify right side
    186.61x = 44,125.16
  5. Step 5: Solve for x
    x = 44,125.16/186.61
  6. Step 6: Final answer
    x = 236.46

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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.