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Finding the Fourth Proportional to 93.61, 139.83 and 91.18

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Solution

The fourth proportional to 93.61, 139.83 and 91.18 is: 136.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.61 : 139.83 = 91.18 : x
  2. Step 2: Convert to fraction form
    93.61/139.83 = 91.18/x
  3. Step 3: Cross multiply
    93.61x = 139.83 × 91.18
  4. Step 4: Simplify right side
    93.61x = 12,748.75
  5. Step 5: Solve for x
    x = 12,748.75/93.61
  6. Step 6: Final answer
    x = 136.20

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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.