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Finding the Fourth Proportional to 286.70, 430.18 and 104.22

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Solution

The fourth proportional to 286.70, 430.18 and 104.22 is: 156.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.70 : 430.18 = 104.22 : x
  2. Step 2: Convert to fraction form
    286.70/430.18 = 104.22/x
  3. Step 3: Cross multiply
    286.70x = 430.18 × 104.22
  4. Step 4: Simplify right side
    286.70x = 44,833.36
  5. Step 5: Solve for x
    x = 44,833.36/286.70
  6. Step 6: Final answer
    x = 156.38

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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.