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Finding the Fourth Proportional to 73.51, 102.15 and 72.77

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Solution

The fourth proportional to 73.51, 102.15 and 72.77 is: 101.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.51 : 102.15 = 72.77 : x
  2. Step 2: Convert to fraction form
    73.51/102.15 = 72.77/x
  3. Step 3: Cross multiply
    73.51x = 102.15 × 72.77
  4. Step 4: Simplify right side
    73.51x = 7,433.46
  5. Step 5: Solve for x
    x = 7,433.46/73.51
  6. Step 6: Final answer
    x = 101.12

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.