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Finding the Fourth Proportional to 186.60, 256.80 and 153.60

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Solution

The fourth proportional to 186.60, 256.80 and 153.60 is: 211.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.60 : 256.80 = 153.60 : x
  2. Step 2: Convert to fraction form
    186.60/256.80 = 153.60/x
  3. Step 3: Cross multiply
    186.60x = 256.80 × 153.60
  4. Step 4: Simplify right side
    186.60x = 39,444.48
  5. Step 5: Solve for x
    x = 39,444.48/186.60
  6. Step 6: Final answer
    x = 211.39

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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.