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Finding the Fourth Proportional to 478.06, 717.11 and 189.47

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Solution

The fourth proportional to 478.06, 717.11 and 189.47 is: 284.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.06 : 717.11 = 189.47 : x
  2. Step 2: Convert to fraction form
    478.06/717.11 = 189.47/x
  3. Step 3: Cross multiply
    478.06x = 717.11 × 189.47
  4. Step 4: Simplify right side
    478.06x = 135,870.83
  5. Step 5: Solve for x
    x = 135,870.83/478.06
  6. Step 6: Final answer
    x = 284.21

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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.