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Finding the Fourth Proportional to 93.78, 141.55 and 90.57

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Solution

The fourth proportional to 93.78, 141.55 and 90.57 is: 136.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.78 : 141.55 = 90.57 : x
  2. Step 2: Convert to fraction form
    93.78/141.55 = 90.57/x
  3. Step 3: Cross multiply
    93.78x = 141.55 × 90.57
  4. Step 4: Simplify right side
    93.78x = 12,819.69
  5. Step 5: Solve for x
    x = 12,819.69/93.78
  6. Step 6: Final answer
    x = 136.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.