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Finding the Fourth Proportional to 286.78, 430.17 and 104.15

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Solution

The fourth proportional to 286.78, 430.17 and 104.15 is: 156.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.78 : 430.17 = 104.15 : x
  2. Step 2: Convert to fraction form
    286.78/430.17 = 104.15/x
  3. Step 3: Cross multiply
    286.78x = 430.17 × 104.15
  4. Step 4: Simplify right side
    286.78x = 44,802.21
  5. Step 5: Solve for x
    x = 44,802.21/286.78
  6. Step 6: Final answer
    x = 156.23

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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.