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Finding the Fourth Proportional to 72.20, 99.61 and 43.10

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Solution

The fourth proportional to 72.20, 99.61 and 43.10 is: 59.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.20 : 99.61 = 43.10 : x
  2. Step 2: Convert to fraction form
    72.20/99.61 = 43.10/x
  3. Step 3: Cross multiply
    72.20x = 99.61 × 43.10
  4. Step 4: Simplify right side
    72.20x = 4,293.19
  5. Step 5: Solve for x
    x = 4,293.19/72.20
  6. Step 6: Final answer
    x = 59.46

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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.