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Finding the Fourth Proportional to 88.15, 121.49 and 72.51

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Solution

The fourth proportional to 88.15, 121.49 and 72.51 is: 99.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.15 : 121.49 = 72.51 : x
  2. Step 2: Convert to fraction form
    88.15/121.49 = 72.51/x
  3. Step 3: Cross multiply
    88.15x = 121.49 × 72.51
  4. Step 4: Simplify right side
    88.15x = 8,809.24
  5. Step 5: Solve for x
    x = 8,809.24/88.15
  6. Step 6: Final answer
    x = 99.93

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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.