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Finding the Fourth Proportional to 88.63, 121.58 and 86.23

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Solution

The fourth proportional to 88.63, 121.58 and 86.23 is: 118.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.63 : 121.58 = 86.23 : x
  2. Step 2: Convert to fraction form
    88.63/121.58 = 86.23/x
  3. Step 3: Cross multiply
    88.63x = 121.58 × 86.23
  4. Step 4: Simplify right side
    88.63x = 10,483.86
  5. Step 5: Solve for x
    x = 10,483.86/88.63
  6. Step 6: Final answer
    x = 118.29

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.