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Finding the Fourth Proportional to 93.14, 128.59 and 72.38

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Solution

The fourth proportional to 93.14, 128.59 and 72.38 is: 99.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.14 : 128.59 = 72.38 : x
  2. Step 2: Convert to fraction form
    93.14/128.59 = 72.38/x
  3. Step 3: Cross multiply
    93.14x = 128.59 × 72.38
  4. Step 4: Simplify right side
    93.14x = 9,307.34
  5. Step 5: Solve for x
    x = 9,307.34/93.14
  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.