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Finding the Fourth Proportional to 305.63, 421.65 and 187.58

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Solution

The fourth proportional to 305.63, 421.65 and 187.58 is: 258.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.63 : 421.65 = 187.58 : x
  2. Step 2: Convert to fraction form
    305.63/421.65 = 187.58/x
  3. Step 3: Cross multiply
    305.63x = 421.65 × 187.58
  4. Step 4: Simplify right side
    305.63x = 79,093.11
  5. Step 5: Solve for x
    x = 79,093.11/305.63
  6. Step 6: Final answer
    x = 258.79

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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.