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Finding the Fourth Proportional to 56.31, 77.78 and 45.43

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Solution

The fourth proportional to 56.31, 77.78 and 45.43 is: 62.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.31 : 77.78 = 45.43 : x
  2. Step 2: Convert to fraction form
    56.31/77.78 = 45.43/x
  3. Step 3: Cross multiply
    56.31x = 77.78 × 45.43
  4. Step 4: Simplify right side
    56.31x = 3,533.55
  5. Step 5: Solve for x
    x = 3,533.55/56.31
  6. Step 6: Final answer
    x = 62.75

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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.