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Finding the Fourth Proportional to 55.99, 84.51 and 53.86

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Solution

The fourth proportional to 55.99, 84.51 and 53.86 is: 81.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.99 : 84.51 = 53.86 : x
  2. Step 2: Convert to fraction form
    55.99/84.51 = 53.86/x
  3. Step 3: Cross multiply
    55.99x = 84.51 × 53.86
  4. Step 4: Simplify right side
    55.99x = 4,551.71
  5. Step 5: Solve for x
    x = 4,551.71/55.99
  6. Step 6: Final answer
    x = 81.30

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.