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Finding the Fourth Proportional to 109.78, 164.80 and 58.45

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Solution

The fourth proportional to 109.78, 164.80 and 58.45 is: 87.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.78 : 164.80 = 58.45 : x
  2. Step 2: Convert to fraction form
    109.78/164.80 = 58.45/x
  3. Step 3: Cross multiply
    109.78x = 164.80 × 58.45
  4. Step 4: Simplify right side
    109.78x = 9,632.56
  5. Step 5: Solve for x
    x = 9,632.56/109.78
  6. Step 6: Final answer
    x = 87.74

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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.