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Finding the Fourth Proportional to 458.78, 633.12 and 251.78

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Solution

The fourth proportional to 458.78, 633.12 and 251.78 is: 347.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.78 : 633.12 = 251.78 : x
  2. Step 2: Convert to fraction form
    458.78/633.12 = 251.78/x
  3. Step 3: Cross multiply
    458.78x = 633.12 × 251.78
  4. Step 4: Simplify right side
    458.78x = 159,406.95
  5. Step 5: Solve for x
    x = 159,406.95/458.78
  6. Step 6: Final answer
    x = 347.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.