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Finding the Fourth Proportional to 93.18, 128.71 and 79.35

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Solution

The fourth proportional to 93.18, 128.71 and 79.35 is: 109.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.18 : 128.71 = 79.35 : x
  2. Step 2: Convert to fraction form
    93.18/128.71 = 79.35/x
  3. Step 3: Cross multiply
    93.18x = 128.71 × 79.35
  4. Step 4: Simplify right side
    93.18x = 10,214.06
  5. Step 5: Solve for x
    x = 10,214.06/93.18
  6. Step 6: Final answer
    x = 109.62

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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.