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Finding the Fourth Proportional to 93.49, 128.95 and 64.42

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Solution

The fourth proportional to 93.49, 128.95 and 64.42 is: 88.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.49 : 128.95 = 64.42 : x
  2. Step 2: Convert to fraction form
    93.49/128.95 = 64.42/x
  3. Step 3: Cross multiply
    93.49x = 128.95 × 64.42
  4. Step 4: Simplify right side
    93.49x = 8,306.96
  5. Step 5: Solve for x
    x = 8,306.96/93.49
  6. Step 6: Final answer
    x = 88.85

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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.