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Finding the Fourth Proportional to 72.05, 99.36 and 47.45

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Solution

The fourth proportional to 72.05, 99.36 and 47.45 is: 65.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.05 : 99.36 = 47.45 : x
  2. Step 2: Convert to fraction form
    72.05/99.36 = 47.45/x
  3. Step 3: Cross multiply
    72.05x = 99.36 × 47.45
  4. Step 4: Simplify right side
    72.05x = 4,714.14
  5. Step 5: Solve for x
    x = 4,714.14/72.05
  6. Step 6: Final answer
    x = 65.43

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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.