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Finding the Fourth Proportional to 72.36, 99.63 and 70.85

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Solution

The fourth proportional to 72.36, 99.63 and 70.85 is: 97.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.36 : 99.63 = 70.85 : x
  2. Step 2: Convert to fraction form
    72.36/99.63 = 70.85/x
  3. Step 3: Cross multiply
    72.36x = 99.63 × 70.85
  4. Step 4: Simplify right side
    72.36x = 7,058.29
  5. Step 5: Solve for x
    x = 7,058.29/72.36
  6. Step 6: Final answer
    x = 97.54

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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.