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Finding the Fourth Proportional to 76.42, 114.63 and 64.45

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Solution

The fourth proportional to 76.42, 114.63 and 64.45 is: 96.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.42 : 114.63 = 64.45 : x
  2. Step 2: Convert to fraction form
    76.42/114.63 = 64.45/x
  3. Step 3: Cross multiply
    76.42x = 114.63 × 64.45
  4. Step 4: Simplify right side
    76.42x = 7,387.90
  5. Step 5: Solve for x
    x = 7,387.90/76.42
  6. Step 6: Final answer
    x = 96.68

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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.