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Finding the Fourth Proportional to 55.52, 76.70 and 45.80

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Solution

The fourth proportional to 55.52, 76.70 and 45.80 is: 63.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.52 : 76.70 = 45.80 : x
  2. Step 2: Convert to fraction form
    55.52/76.70 = 45.80/x
  3. Step 3: Cross multiply
    55.52x = 76.70 × 45.80
  4. Step 4: Simplify right side
    55.52x = 3,512.86
  5. Step 5: Solve for x
    x = 3,512.86/55.52
  6. Step 6: Final answer
    x = 63.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.