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Finding the Fourth Proportional to 56.53, 77.91 and 55.49

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Solution

The fourth proportional to 56.53, 77.91 and 55.49 is: 76.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.53 : 77.91 = 55.49 : x
  2. Step 2: Convert to fraction form
    56.53/77.91 = 55.49/x
  3. Step 3: Cross multiply
    56.53x = 77.91 × 55.49
  4. Step 4: Simplify right side
    56.53x = 4,322.95
  5. Step 5: Solve for x
    x = 4,322.95/56.53
  6. Step 6: Final answer
    x = 76.47

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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.