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Finding the Fourth Proportional to 56.66, 78.21 and 43.73

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Solution

The fourth proportional to 56.66, 78.21 and 43.73 is: 60.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.66 : 78.21 = 43.73 : x
  2. Step 2: Convert to fraction form
    56.66/78.21 = 43.73/x
  3. Step 3: Cross multiply
    56.66x = 78.21 × 43.73
  4. Step 4: Simplify right side
    56.66x = 3,420.12
  5. Step 5: Solve for x
    x = 3,420.12/56.66
  6. Step 6: Final answer
    x = 60.36

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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.