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Finding the Fourth Proportional to 56.60, 77.11 and 55.55

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Solution

The fourth proportional to 56.60, 77.11 and 55.55 is: 75.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.60 : 77.11 = 55.55 : x
  2. Step 2: Convert to fraction form
    56.60/77.11 = 55.55/x
  3. Step 3: Cross multiply
    56.60x = 77.11 × 55.55
  4. Step 4: Simplify right side
    56.60x = 4,283.46
  5. Step 5: Solve for x
    x = 4,283.46/56.60
  6. Step 6: Final answer
    x = 75.68

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.