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Finding the Fourth Proportional to 304.19, 456.21 and 87.78

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Solution

The fourth proportional to 304.19, 456.21 and 87.78 is: 131.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.19 : 456.21 = 87.78 : x
  2. Step 2: Convert to fraction form
    304.19/456.21 = 87.78/x
  3. Step 3: Cross multiply
    304.19x = 456.21 × 87.78
  4. Step 4: Simplify right side
    304.19x = 40,046.11
  5. Step 5: Solve for x
    x = 40,046.11/304.19
  6. Step 6: Final answer
    x = 131.65

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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.