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Finding the Fourth Proportional to 89.06, 122.91 and 52.21

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Solution

The fourth proportional to 89.06, 122.91 and 52.21 is: 72.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.06 : 122.91 = 52.21 : x
  2. Step 2: Convert to fraction form
    89.06/122.91 = 52.21/x
  3. Step 3: Cross multiply
    89.06x = 122.91 × 52.21
  4. Step 4: Simplify right side
    89.06x = 6,417.13
  5. Step 5: Solve for x
    x = 6,417.13/89.06
  6. Step 6: Final answer
    x = 72.05

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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.