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Finding the Fourth Proportional to 93.40, 139.86 and 57.28

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Solution

The fourth proportional to 93.40, 139.86 and 57.28 is: 85.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.40 : 139.86 = 57.28 : x
  2. Step 2: Convert to fraction form
    93.40/139.86 = 57.28/x
  3. Step 3: Cross multiply
    93.40x = 139.86 × 57.28
  4. Step 4: Simplify right side
    93.40x = 8,011.18
  5. Step 5: Solve for x
    x = 8,011.18/93.40
  6. Step 6: Final answer
    x = 85.77

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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.