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Finding the Fourth Proportional to 287.16, 430.78 and 104.56

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Solution

The fourth proportional to 287.16, 430.78 and 104.56 is: 156.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.16 : 430.78 = 104.56 : x
  2. Step 2: Convert to fraction form
    287.16/430.78 = 104.56/x
  3. Step 3: Cross multiply
    287.16x = 430.78 × 104.56
  4. Step 4: Simplify right side
    287.16x = 45,042.36
  5. Step 5: Solve for x
    x = 45,042.36/287.16
  6. Step 6: Final answer
    x = 156.85

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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.