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Finding the Fourth Proportional to 230.51, 345.86 and 86.20

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Solution

The fourth proportional to 230.51, 345.86 and 86.20 is: 129.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.51 : 345.86 = 86.20 : x
  2. Step 2: Convert to fraction form
    230.51/345.86 = 86.20/x
  3. Step 3: Cross multiply
    230.51x = 345.86 × 86.20
  4. Step 4: Simplify right side
    230.51x = 29,813.13
  5. Step 5: Solve for x
    x = 29,813.13/230.51
  6. Step 6: Final answer
    x = 129.34

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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.