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Finding the Fourth Proportional to 478.50, 718.05 and 189.96

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Solution

The fourth proportional to 478.50, 718.05 and 189.96 is: 285.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.50 : 718.05 = 189.96 : x
  2. Step 2: Convert to fraction form
    478.50/718.05 = 189.96/x
  3. Step 3: Cross multiply
    478.50x = 718.05 × 189.96
  4. Step 4: Simplify right side
    478.50x = 136,400.78
  5. Step 5: Solve for x
    x = 136,400.78/478.50
  6. Step 6: Final answer
    x = 285.06

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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.