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Finding the Fourth Proportional to 114.31, 157.54 and 86.68

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Solution

The fourth proportional to 114.31, 157.54 and 86.68 is: 119.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.31 : 157.54 = 86.68 : x
  2. Step 2: Convert to fraction form
    114.31/157.54 = 86.68/x
  3. Step 3: Cross multiply
    114.31x = 157.54 × 86.68
  4. Step 4: Simplify right side
    114.31x = 13,655.57
  5. Step 5: Solve for x
    x = 13,655.57/114.31
  6. Step 6: Final answer
    x = 119.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.