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Finding the Fourth Proportional to 55.60, 76.65 and 40.86

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Solution

The fourth proportional to 55.60, 76.65 and 40.86 is: 56.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.60 : 76.65 = 40.86 : x
  2. Step 2: Convert to fraction form
    55.60/76.65 = 40.86/x
  3. Step 3: Cross multiply
    55.60x = 76.65 × 40.86
  4. Step 4: Simplify right side
    55.60x = 3,131.92
  5. Step 5: Solve for x
    x = 3,131.92/55.60
  6. Step 6: Final answer
    x = 56.33

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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.