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Finding the Fourth Proportional to 93.54, 139.62 and 87.18

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Solution

The fourth proportional to 93.54, 139.62 and 87.18 is: 130.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.54 : 139.62 = 87.18 : x
  2. Step 2: Convert to fraction form
    93.54/139.62 = 87.18/x
  3. Step 3: Cross multiply
    93.54x = 139.62 × 87.18
  4. Step 4: Simplify right side
    93.54x = 12,172.07
  5. Step 5: Solve for x
    x = 12,172.07/93.54
  6. Step 6: Final answer
    x = 130.13

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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.