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Finding the Fourth Proportional to 186.47, 257.46 and 151.91

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Solution

The fourth proportional to 186.47, 257.46 and 151.91 is: 209.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.47 : 257.46 = 151.91 : x
  2. Step 2: Convert to fraction form
    186.47/257.46 = 151.91/x
  3. Step 3: Cross multiply
    186.47x = 257.46 × 151.91
  4. Step 4: Simplify right side
    186.47x = 39,110.75
  5. Step 5: Solve for x
    x = 39,110.75/186.47
  6. Step 6: Final answer
    x = 209.74

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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.