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Finding the Fourth Proportional to 72.36, 99.78 and 52.92

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Solution

The fourth proportional to 72.36, 99.78 and 52.92 is: 72.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.36 : 99.78 = 52.92 : x
  2. Step 2: Convert to fraction form
    72.36/99.78 = 52.92/x
  3. Step 3: Cross multiply
    72.36x = 99.78 × 52.92
  4. Step 4: Simplify right side
    72.36x = 5,280.36
  5. Step 5: Solve for x
    x = 5,280.36/72.36
  6. Step 6: Final answer
    x = 72.97

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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.