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Finding the Fourth Proportional to 93.02, 139.52 and 57.20

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Solution

The fourth proportional to 93.02, 139.52 and 57.20 is: 85.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.02 : 139.52 = 57.20 : x
  2. Step 2: Convert to fraction form
    93.02/139.52 = 57.20/x
  3. Step 3: Cross multiply
    93.02x = 139.52 × 57.20
  4. Step 4: Simplify right side
    93.02x = 7,980.54
  5. Step 5: Solve for x
    x = 7,980.54/93.02
  6. Step 6: Final answer
    x = 85.79

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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.