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Finding the Fourth Proportional to 58.98, 81.77 and 55.30

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Solution

The fourth proportional to 58.98, 81.77 and 55.30 is: 76.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.98 : 81.77 = 55.30 : x
  2. Step 2: Convert to fraction form
    58.98/81.77 = 55.30/x
  3. Step 3: Cross multiply
    58.98x = 81.77 × 55.30
  4. Step 4: Simplify right side
    58.98x = 4,521.60
  5. Step 5: Solve for x
    x = 4,521.60/58.98
  6. Step 6: Final answer
    x = 76.66

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.