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Finding the Fourth Proportional to 76.40, 114.62 and 60.40

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Solution

The fourth proportional to 76.40, 114.62 and 60.40 is: 90.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.40 : 114.62 = 60.40 : x
  2. Step 2: Convert to fraction form
    76.40/114.62 = 60.40/x
  3. Step 3: Cross multiply
    76.40x = 114.62 × 60.40
  4. Step 4: Simplify right side
    76.40x = 6,923.05
  5. Step 5: Solve for x
    x = 6,923.05/76.40
  6. Step 6: Final answer
    x = 90.62

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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.