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Finding the Fourth Proportional to 105.53, 158.40 and 51.47

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Solution

The fourth proportional to 105.53, 158.40 and 51.47 is: 77.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.53 : 158.40 = 51.47 : x
  2. Step 2: Convert to fraction form
    105.53/158.40 = 51.47/x
  3. Step 3: Cross multiply
    105.53x = 158.40 × 51.47
  4. Step 4: Simplify right side
    105.53x = 8,152.85
  5. Step 5: Solve for x
    x = 8,152.85/105.53
  6. Step 6: Final answer
    x = 77.26

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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.