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Finding the Fourth Proportional to 93.48, 128.76 and 72.76

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Solution

The fourth proportional to 93.48, 128.76 and 72.76 is: 100.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.48 : 128.76 = 72.76 : x
  2. Step 2: Convert to fraction form
    93.48/128.76 = 72.76/x
  3. Step 3: Cross multiply
    93.48x = 128.76 × 72.76
  4. Step 4: Simplify right side
    93.48x = 9,367.93
  5. Step 5: Solve for x
    x = 9,367.93/93.48
  6. Step 6: Final answer
    x = 100.21

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.