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Finding the Fourth Proportional to 93.12, 139.69 and 31.40

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Solution

The fourth proportional to 93.12, 139.69 and 31.40 is: 47.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.12 : 139.69 = 31.40 : x
  2. Step 2: Convert to fraction form
    93.12/139.69 = 31.40/x
  3. Step 3: Cross multiply
    93.12x = 139.69 × 31.40
  4. Step 4: Simplify right side
    93.12x = 4,385.57
  5. Step 5: Solve for x
    x = 4,385.57/93.12
  6. Step 6: Final answer
    x = 47.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.