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Finding the Fourth Proportional to 56.79, 85.70 and 55.37

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Solution

The fourth proportional to 56.79, 85.70 and 55.37 is: 83.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.79 : 85.70 = 55.37 : x
  2. Step 2: Convert to fraction form
    56.79/85.70 = 55.37/x
  3. Step 3: Cross multiply
    56.79x = 85.70 × 55.37
  4. Step 4: Simplify right side
    56.79x = 4,744.50
  5. Step 5: Solve for x
    x = 4,744.50/56.79
  6. Step 6: Final answer
    x = 83.54

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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.