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Finding the Fourth Proportional to 286.90, 430.52 and 104.28

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Solution

The fourth proportional to 286.90, 430.52 and 104.28 is: 156.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.90 : 430.52 = 104.28 : x
  2. Step 2: Convert to fraction form
    286.90/430.52 = 104.28/x
  3. Step 3: Cross multiply
    286.90x = 430.52 × 104.28
  4. Step 4: Simplify right side
    286.90x = 44,894.63
  5. Step 5: Solve for x
    x = 44,894.63/286.90
  6. Step 6: Final answer
    x = 156.48

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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.