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Finding the Fourth Proportional to 57.36, 86.50 and 56.59

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Solution

The fourth proportional to 57.36, 86.50 and 56.59 is: 85.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.36 : 86.50 = 56.59 : x
  2. Step 2: Convert to fraction form
    57.36/86.50 = 56.59/x
  3. Step 3: Cross multiply
    57.36x = 86.50 × 56.59
  4. Step 4: Simplify right side
    57.36x = 4,894.32
  5. Step 5: Solve for x
    x = 4,894.32/57.36
  6. Step 6: Final answer
    x = 85.33

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.