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Finding the Fourth Proportional to 75.17, 103.61 and 72.34

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Solution

The fourth proportional to 75.17, 103.61 and 72.34 is: 99.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.17 : 103.61 = 72.34 : x
  2. Step 2: Convert to fraction form
    75.17/103.61 = 72.34/x
  3. Step 3: Cross multiply
    75.17x = 103.61 × 72.34
  4. Step 4: Simplify right side
    75.17x = 7,495.07
  5. Step 5: Solve for x
    x = 7,495.07/75.17
  6. Step 6: Final answer
    x = 99.70

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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.