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Finding the Fourth Proportional to 104.30, 157.15 and 87.51

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Solution

The fourth proportional to 104.30, 157.15 and 87.51 is: 131.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.30 : 157.15 = 87.51 : x
  2. Step 2: Convert to fraction form
    104.30/157.15 = 87.51/x
  3. Step 3: Cross multiply
    104.30x = 157.15 × 87.51
  4. Step 4: Simplify right side
    104.30x = 13,751.98
  5. Step 5: Solve for x
    x = 13,751.98/104.30
  6. Step 6: Final answer
    x = 131.86

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.