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Finding the Fourth Proportional to 93.56, 139.32 and 87.72

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Solution

The fourth proportional to 93.56, 139.32 and 87.72 is: 130.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.56 : 139.32 = 87.72 : x
  2. Step 2: Convert to fraction form
    93.56/139.32 = 87.72/x
  3. Step 3: Cross multiply
    93.56x = 139.32 × 87.72
  4. Step 4: Simplify right side
    93.56x = 12,220.63
  5. Step 5: Solve for x
    x = 12,220.63/93.56
  6. Step 6: Final answer
    x = 130.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.