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Finding the Fourth Proportional to 458.78, 687 and 304.22

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Solution

The fourth proportional to 458.78, 687 and 304.22 is: 455.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.78 : 687 = 304.22 : x
  2. Step 2: Convert to fraction form
    458.78/687 = 304.22/x
  3. Step 3: Cross multiply
    458.78x = 687 × 304.22
  4. Step 4: Simplify right side
    458.78x = 208,999.14
  5. Step 5: Solve for x
    x = 208,999.14/458.78
  6. Step 6: Final answer
    x = 455.55

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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.