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Finding the Fourth Proportional to 93.23, 128.58 and 65.19

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Solution

The fourth proportional to 93.23, 128.58 and 65.19 is: 89.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.23 : 128.58 = 65.19 : x
  2. Step 2: Convert to fraction form
    93.23/128.58 = 65.19/x
  3. Step 3: Cross multiply
    93.23x = 128.58 × 65.19
  4. Step 4: Simplify right side
    93.23x = 8,382.13
  5. Step 5: Solve for x
    x = 8,382.13/93.23
  6. Step 6: Final answer
    x = 89.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.