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Finding the Fourth Proportional to 114.86, 158.45 and 87.32

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Solution

The fourth proportional to 114.86, 158.45 and 87.32 is: 120.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.86 : 158.45 = 87.32 : x
  2. Step 2: Convert to fraction form
    114.86/158.45 = 87.32/x
  3. Step 3: Cross multiply
    114.86x = 158.45 × 87.32
  4. Step 4: Simplify right side
    114.86x = 13,835.85
  5. Step 5: Solve for x
    x = 13,835.85/114.86
  6. Step 6: Final answer
    x = 120.46

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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.