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Finding the Fourth Proportional to 93.77, 139.77 and 86.48

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Solution

The fourth proportional to 93.77, 139.77 and 86.48 is: 128.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.77 : 139.77 = 86.48 : x
  2. Step 2: Convert to fraction form
    93.77/139.77 = 86.48/x
  3. Step 3: Cross multiply
    93.77x = 139.77 × 86.48
  4. Step 4: Simplify right side
    93.77x = 12,086.61
  5. Step 5: Solve for x
    x = 12,086.61/93.77
  6. Step 6: Final answer
    x = 128.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.