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Finding the Fourth Proportional to 478.72, 717.12 and 386.96

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Solution

The fourth proportional to 478.72, 717.12 and 386.96 is: 579.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.72 : 717.12 = 386.96 : x
  2. Step 2: Convert to fraction form
    478.72/717.12 = 386.96/x
  3. Step 3: Cross multiply
    478.72x = 717.12 × 386.96
  4. Step 4: Simplify right side
    478.72x = 277,496.76
  5. Step 5: Solve for x
    x = 277,496.76/478.72
  6. Step 6: Final answer
    x = 579.66

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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.