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Finding the Fourth Proportional to 55.59, 83.80 and 51.87

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Solution

The fourth proportional to 55.59, 83.80 and 51.87 is: 78.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.59 : 83.80 = 51.87 : x
  2. Step 2: Convert to fraction form
    55.59/83.80 = 51.87/x
  3. Step 3: Cross multiply
    55.59x = 83.80 × 51.87
  4. Step 4: Simplify right side
    55.59x = 4,346.89
  5. Step 5: Solve for x
    x = 4,346.89/55.59
  6. Step 6: Final answer
    x = 78.20

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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.