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Finding the Fourth Proportional to 105.53, 158.13 and 56.78

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Solution

The fourth proportional to 105.53, 158.13 and 56.78 is: 85.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.53 : 158.13 = 56.78 : x
  2. Step 2: Convert to fraction form
    105.53/158.13 = 56.78/x
  3. Step 3: Cross multiply
    105.53x = 158.13 × 56.78
  4. Step 4: Simplify right side
    105.53x = 8,978.34
  5. Step 5: Solve for x
    x = 8,978.34/105.53
  6. Step 6: Final answer
    x = 85.08

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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.