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Finding the Fourth Proportional to 478.90, 717.81 and 190

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Solution

The fourth proportional to 478.90, 717.81 and 190 is: 284.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.90 : 717.81 = 190 : x
  2. Step 2: Convert to fraction form
    478.90/717.81 = 190/x
  3. Step 3: Cross multiply
    478.90x = 717.81 × 190
  4. Step 4: Simplify right side
    478.90x = 136,383.90
  5. Step 5: Solve for x
    x = 136,383.90/478.90
  6. Step 6: Final answer
    x = 284.79

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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.