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Finding the Fourth Proportional to 55.69, 83.88 and 45.61

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Solution

The fourth proportional to 55.69, 83.88 and 45.61 is: 68.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.69 : 83.88 = 45.61 : x
  2. Step 2: Convert to fraction form
    55.69/83.88 = 45.61/x
  3. Step 3: Cross multiply
    55.69x = 83.88 × 45.61
  4. Step 4: Simplify right side
    55.69x = 3,825.77
  5. Step 5: Solve for x
    x = 3,825.77/55.69
  6. Step 6: Final answer
    x = 68.70

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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.