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Finding the Fourth Proportional to 58.78, 80.99 and 40.32

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Solution

The fourth proportional to 58.78, 80.99 and 40.32 is: 55.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.78 : 80.99 = 40.32 : x
  2. Step 2: Convert to fraction form
    58.78/80.99 = 40.32/x
  3. Step 3: Cross multiply
    58.78x = 80.99 × 40.32
  4. Step 4: Simplify right side
    58.78x = 3,265.64
  5. Step 5: Solve for x
    x = 3,265.64/58.78
  6. Step 6: Final answer
    x = 55.56

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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.