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Finding the Fourth Proportional to 76.49, 114.81 and 56.99

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Solution

The fourth proportional to 76.49, 114.81 and 56.99 is: 85.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.49 : 114.81 = 56.99 : x
  2. Step 2: Convert to fraction form
    76.49/114.81 = 56.99/x
  3. Step 3: Cross multiply
    76.49x = 114.81 × 56.99
  4. Step 4: Simplify right side
    76.49x = 6,543.02
  5. Step 5: Solve for x
    x = 6,543.02/76.49
  6. Step 6: Final answer
    x = 85.54

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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.