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Finding the Fourth Proportional to 56.20, 77.55 and 31.64

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Solution

The fourth proportional to 56.20, 77.55 and 31.64 is: 43.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.20 : 77.55 = 31.64 : x
  2. Step 2: Convert to fraction form
    56.20/77.55 = 31.64/x
  3. Step 3: Cross multiply
    56.20x = 77.55 × 31.64
  4. Step 4: Simplify right side
    56.20x = 2,453.14
  5. Step 5: Solve for x
    x = 2,453.14/56.20
  6. Step 6: Final answer
    x = 43.65

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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.