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Finding the Fourth Proportional to 93, 139.26 and 85.48

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Solution

The fourth proportional to 93, 139.26 and 85.48 is: 128.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    93 : 139.26 = 85.48 : x
  2. Step 2: Convert to fraction form
    93/139.26 = 85.48/x
  3. Step 3: Cross multiply
    93x = 139.26 × 85.48
  4. Step 4: Simplify right side
    93x = 11,903.94
  5. Step 5: Solve for x
    x = 11,903.94/93
  6. Step 6: Final answer
    x = 128.00

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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.