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Finding the Fourth Proportional to 55.79, 83.61 and 42.91

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Solution

The fourth proportional to 55.79, 83.61 and 42.91 is: 64.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.79 : 83.61 = 42.91 : x
  2. Step 2: Convert to fraction form
    55.79/83.61 = 42.91/x
  3. Step 3: Cross multiply
    55.79x = 83.61 × 42.91
  4. Step 4: Simplify right side
    55.79x = 3,587.71
  5. Step 5: Solve for x
    x = 3,587.71/55.79
  6. Step 6: Final answer
    x = 64.31

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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.