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Finding the Fourth Proportional to 93.14, 128.16 and 90.76

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Solution

The fourth proportional to 93.14, 128.16 and 90.76 is: 124.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.14 : 128.16 = 90.76 : x
  2. Step 2: Convert to fraction form
    93.14/128.16 = 90.76/x
  3. Step 3: Cross multiply
    93.14x = 128.16 × 90.76
  4. Step 4: Simplify right side
    93.14x = 11,631.48
  5. Step 5: Solve for x
    x = 11,631.48/93.14
  6. Step 6: Final answer
    x = 124.88

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Find fourth proportional to 46.57, 64.08 and 45.38
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Double scale
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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.