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Finding the Fourth Proportional to 72.06, 99.30 and 50.19

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Solution

The fourth proportional to 72.06, 99.30 and 50.19 is: 69.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.06 : 99.30 = 50.19 : x
  2. Step 2: Convert to fraction form
    72.06/99.30 = 50.19/x
  3. Step 3: Cross multiply
    72.06x = 99.30 × 50.19
  4. Step 4: Simplify right side
    72.06x = 4,983.87
  5. Step 5: Solve for x
    x = 4,983.87/72.06
  6. Step 6: Final answer
    x = 69.16

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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.