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Finding the Fourth Proportional to 88.61, 122.29 and 55.43

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Solution

The fourth proportional to 88.61, 122.29 and 55.43 is: 76.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.61 : 122.29 = 55.43 : x
  2. Step 2: Convert to fraction form
    88.61/122.29 = 55.43/x
  3. Step 3: Cross multiply
    88.61x = 122.29 × 55.43
  4. Step 4: Simplify right side
    88.61x = 6,779.24
  5. Step 5: Solve for x
    x = 6,779.24/88.61
  6. Step 6: Final answer
    x = 76.51

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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.