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Finding the Fourth Proportional to 478.47, 717.56 and 258.96

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Solution

The fourth proportional to 478.47, 717.56 and 258.96 is: 388.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.47 : 717.56 = 258.96 : x
  2. Step 2: Convert to fraction form
    478.47/717.56 = 258.96/x
  3. Step 3: Cross multiply
    478.47x = 717.56 × 258.96
  4. Step 4: Simplify right side
    478.47x = 185,819.34
  5. Step 5: Solve for x
    x = 185,819.34/478.47
  6. Step 6: Final answer
    x = 388.36

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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.