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Finding the Fourth Proportional to 93.37, 128.76 and 64.21

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Solution

The fourth proportional to 93.37, 128.76 and 64.21 is: 88.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.37 : 128.76 = 64.21 : x
  2. Step 2: Convert to fraction form
    93.37/128.76 = 64.21/x
  3. Step 3: Cross multiply
    93.37x = 128.76 × 64.21
  4. Step 4: Simplify right side
    93.37x = 8,267.68
  5. Step 5: Solve for x
    x = 8,267.68/93.37
  6. Step 6: Final answer
    x = 88.55

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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.