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Finding the Fourth Proportional to 76.99, 115.53 and 42.77

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Solution

The fourth proportional to 76.99, 115.53 and 42.77 is: 64.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.99 : 115.53 = 42.77 : x
  2. Step 2: Convert to fraction form
    76.99/115.53 = 42.77/x
  3. Step 3: Cross multiply
    76.99x = 115.53 × 42.77
  4. Step 4: Simplify right side
    76.99x = 4,941.40
  5. Step 5: Solve for x
    x = 4,941.40/76.99
  6. Step 6: Final answer
    x = 64.18

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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.