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Finding the Fourth Proportional to 88.80, 122.41 and 64.20

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Solution

The fourth proportional to 88.80, 122.41 and 64.20 is: 88.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.80 : 122.41 = 64.20 : x
  2. Step 2: Convert to fraction form
    88.80/122.41 = 64.20/x
  3. Step 3: Cross multiply
    88.80x = 122.41 × 64.20
  4. Step 4: Simplify right side
    88.80x = 7,858.72
  5. Step 5: Solve for x
    x = 7,858.72/88.80
  6. Step 6: Final answer
    x = 88.50

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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.