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Finding the Fourth Proportional to 305.50, 421.62 and 189.10

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Solution

The fourth proportional to 305.50, 421.62 and 189.10 is: 260.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.50 : 421.62 = 189.10 : x
  2. Step 2: Convert to fraction form
    305.50/421.62 = 189.10/x
  3. Step 3: Cross multiply
    305.50x = 421.62 × 189.10
  4. Step 4: Simplify right side
    305.50x = 79,728.34
  5. Step 5: Solve for x
    x = 79,728.34/305.50
  6. Step 6: Final answer
    x = 260.98

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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.