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Finding the Fourth Proportional to 56.79, 85.09 and 38.77

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Solution

The fourth proportional to 56.79, 85.09 and 38.77 is: 58.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.79 : 85.09 = 38.77 : x
  2. Step 2: Convert to fraction form
    56.79/85.09 = 38.77/x
  3. Step 3: Cross multiply
    56.79x = 85.09 × 38.77
  4. Step 4: Simplify right side
    56.79x = 3,298.94
  5. Step 5: Solve for x
    x = 3,298.94/56.79
  6. Step 6: Final answer
    x = 58.09

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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.