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Finding the Fourth Proportional to 93.16, 139.01 and 86.32

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Solution

The fourth proportional to 93.16, 139.01 and 86.32 is: 128.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.16 : 139.01 = 86.32 : x
  2. Step 2: Convert to fraction form
    93.16/139.01 = 86.32/x
  3. Step 3: Cross multiply
    93.16x = 139.01 × 86.32
  4. Step 4: Simplify right side
    93.16x = 11,999.34
  5. Step 5: Solve for x
    x = 11,999.34/93.16
  6. Step 6: Final answer
    x = 128.80

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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.