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Finding the Fourth Proportional to 305.57, 457.21 and 181.72

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Solution

The fourth proportional to 305.57, 457.21 and 181.72 is: 271.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.57 : 457.21 = 181.72 : x
  2. Step 2: Convert to fraction form
    305.57/457.21 = 181.72/x
  3. Step 3: Cross multiply
    305.57x = 457.21 × 181.72
  4. Step 4: Simplify right side
    305.57x = 83,085.00
  5. Step 5: Solve for x
    x = 83,085.00/305.57
  6. Step 6: Final answer
    x = 271.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.