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Finding the Fourth Proportional to 55.55, 83.34 and 42.79

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Solution

The fourth proportional to 55.55, 83.34 and 42.79 is: 64.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.55 : 83.34 = 42.79 : x
  2. Step 2: Convert to fraction form
    55.55/83.34 = 42.79/x
  3. Step 3: Cross multiply
    55.55x = 83.34 × 42.79
  4. Step 4: Simplify right side
    55.55x = 3,565.91
  5. Step 5: Solve for x
    x = 3,565.91/55.55
  6. Step 6: Final answer
    x = 64.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.