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Finding the Fourth Proportional to 93.86, 129.55 and 57

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Solution

The fourth proportional to 93.86, 129.55 and 57 is: 78.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.86 : 129.55 = 57 : x
  2. Step 2: Convert to fraction form
    93.86/129.55 = 57/x
  3. Step 3: Cross multiply
    93.86x = 129.55 × 57
  4. Step 4: Simplify right side
    93.86x = 7,384.35
  5. Step 5: Solve for x
    x = 7,384.35/93.86
  6. Step 6: Final answer
    x = 78.67

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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.