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Finding the Fourth Proportional to 83.15, 114.64 and 56.91

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Solution

The fourth proportional to 83.15, 114.64 and 56.91 is: 78.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.15 : 114.64 = 56.91 : x
  2. Step 2: Convert to fraction form
    83.15/114.64 = 56.91/x
  3. Step 3: Cross multiply
    83.15x = 114.64 × 56.91
  4. Step 4: Simplify right side
    83.15x = 6,524.16
  5. Step 5: Solve for x
    x = 6,524.16/83.15
  6. Step 6: Final answer
    x = 78.46

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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.