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Finding the Fourth Proportional to 305.81, 458.78 and 123.15

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Solution

The fourth proportional to 305.81, 458.78 and 123.15 is: 184.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.81 : 458.78 = 123.15 : x
  2. Step 2: Convert to fraction form
    305.81/458.78 = 123.15/x
  3. Step 3: Cross multiply
    305.81x = 458.78 × 123.15
  4. Step 4: Simplify right side
    305.81x = 56,498.76
  5. Step 5: Solve for x
    x = 56,498.76/305.81
  6. Step 6: Final answer
    x = 184.75

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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.