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Finding the Fourth Proportional to 305.31, 457.87 and 99.83

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Solution

The fourth proportional to 305.31, 457.87 and 99.83 is: 149.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.31 : 457.87 = 99.83 : x
  2. Step 2: Convert to fraction form
    305.31/457.87 = 99.83/x
  3. Step 3: Cross multiply
    305.31x = 457.87 × 99.83
  4. Step 4: Simplify right side
    305.31x = 45,708.66
  5. Step 5: Solve for x
    x = 45,708.66/305.31
  6. Step 6: Final answer
    x = 149.71

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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.