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Finding the Fourth Proportional to 305.42, 421.50 and 187.38

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Solution

The fourth proportional to 305.42, 421.50 and 187.38 is: 258.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.42 : 421.50 = 187.38 : x
  2. Step 2: Convert to fraction form
    305.42/421.50 = 187.38/x
  3. Step 3: Cross multiply
    305.42x = 421.50 × 187.38
  4. Step 4: Simplify right side
    305.42x = 78,980.67
  5. Step 5: Solve for x
    x = 78,980.67/305.42
  6. Step 6: Final answer
    x = 258.60

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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.