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Finding the Fourth Proportional to 70.05, 96.60 and 56.28

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Solution

The fourth proportional to 70.05, 96.60 and 56.28 is: 77.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.05 : 96.60 = 56.28 : x
  2. Step 2: Convert to fraction form
    70.05/96.60 = 56.28/x
  3. Step 3: Cross multiply
    70.05x = 96.60 × 56.28
  4. Step 4: Simplify right side
    70.05x = 5,436.65
  5. Step 5: Solve for x
    x = 5,436.65/70.05
  6. Step 6: Final answer
    x = 77.61

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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.