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Finding the Fourth Proportional to 93.88, 129.56 and 72

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Solution

The fourth proportional to 93.88, 129.56 and 72 is: 99.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.88 : 129.56 = 72 : x
  2. Step 2: Convert to fraction form
    93.88/129.56 = 72/x
  3. Step 3: Cross multiply
    93.88x = 129.56 × 72
  4. Step 4: Simplify right side
    93.88x = 9,328.32
  5. Step 5: Solve for x
    x = 9,328.32/93.88
  6. Step 6: Final answer
    x = 99.36

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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.