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Finding the Fourth Proportional to 84.48, 116.64 and 56.85

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Solution

The fourth proportional to 84.48, 116.64 and 56.85 is: 78.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.48 : 116.64 = 56.85 : x
  2. Step 2: Convert to fraction form
    84.48/116.64 = 56.85/x
  3. Step 3: Cross multiply
    84.48x = 116.64 × 56.85
  4. Step 4: Simplify right side
    84.48x = 6,630.98
  5. Step 5: Solve for x
    x = 6,630.98/84.48
  6. Step 6: Final answer
    x = 78.49

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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.