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Finding the Fourth Proportional to 72.99, 100.85 and 58.59

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Solution

The fourth proportional to 72.99, 100.85 and 58.59 is: 80.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.99 : 100.85 = 58.59 : x
  2. Step 2: Convert to fraction form
    72.99/100.85 = 58.59/x
  3. Step 3: Cross multiply
    72.99x = 100.85 × 58.59
  4. Step 4: Simplify right side
    72.99x = 5,908.51
  5. Step 5: Solve for x
    x = 5,908.51/72.99
  6. Step 6: Final answer
    x = 80.95

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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.