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Finding the Fourth Proportional to 55.51, 83.68 and 51.79

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Solution

The fourth proportional to 55.51, 83.68 and 51.79 is: 78.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.51 : 83.68 = 51.79 : x
  2. Step 2: Convert to fraction form
    55.51/83.68 = 51.79/x
  3. Step 3: Cross multiply
    55.51x = 83.68 × 51.79
  4. Step 4: Simplify right side
    55.51x = 4,334.28
  5. Step 5: Solve for x
    x = 4,334.28/55.51
  6. Step 6: Final answer
    x = 78.08

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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.