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Finding the Fourth Proportional to 76.16, 114.20 and 70.80

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Solution

The fourth proportional to 76.16, 114.20 and 70.80 is: 106.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.16 : 114.20 = 70.80 : x
  2. Step 2: Convert to fraction form
    76.16/114.20 = 70.80/x
  3. Step 3: Cross multiply
    76.16x = 114.20 × 70.80
  4. Step 4: Simplify right side
    76.16x = 8,085.36
  5. Step 5: Solve for x
    x = 8,085.36/76.16
  6. Step 6: Final answer
    x = 106.16

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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.