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Finding the Fourth Proportional to 88.63, 122.21 and 66.40

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Solution

The fourth proportional to 88.63, 122.21 and 66.40 is: 91.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.63 : 122.21 = 66.40 : x
  2. Step 2: Convert to fraction form
    88.63/122.21 = 66.40/x
  3. Step 3: Cross multiply
    88.63x = 122.21 × 66.40
  4. Step 4: Simplify right side
    88.63x = 8,114.74
  5. Step 5: Solve for x
    x = 8,114.74/88.63
  6. Step 6: Final answer
    x = 91.56

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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.