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Finding the Fourth Proportional to 66.06, 90.84 and 58.77

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Solution

The fourth proportional to 66.06, 90.84 and 58.77 is: 80.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.06 : 90.84 = 58.77 : x
  2. Step 2: Convert to fraction form
    66.06/90.84 = 58.77/x
  3. Step 3: Cross multiply
    66.06x = 90.84 × 58.77
  4. Step 4: Simplify right side
    66.06x = 5,338.67
  5. Step 5: Solve for x
    x = 5,338.67/66.06
  6. Step 6: Final answer
    x = 80.82

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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.