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Finding the Fourth Proportional to 56, 77.60 and 55.70

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Solution

The fourth proportional to 56, 77.60 and 55.70 is: 77.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    56 : 77.60 = 55.70 : x
  2. Step 2: Convert to fraction form
    56/77.60 = 55.70/x
  3. Step 3: Cross multiply
    56x = 77.60 × 55.70
  4. Step 4: Simplify right side
    56x = 4,322.32
  5. Step 5: Solve for x
    x = 4,322.32/56
  6. Step 6: Final answer
    x = 77.18

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.