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Finding the Fourth Proportional to 70.12, 96.89 and 56.28

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Solution

The fourth proportional to 70.12, 96.89 and 56.28 is: 77.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.12 : 96.89 = 56.28 : x
  2. Step 2: Convert to fraction form
    70.12/96.89 = 56.28/x
  3. Step 3: Cross multiply
    70.12x = 96.89 × 56.28
  4. Step 4: Simplify right side
    70.12x = 5,452.97
  5. Step 5: Solve for x
    x = 5,452.97/70.12
  6. Step 6: Final answer
    x = 77.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.