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Finding the Fourth Proportional to 74.37, 102.66 and 72.30

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Solution

The fourth proportional to 74.37, 102.66 and 72.30 is: 99.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.37 : 102.66 = 72.30 : x
  2. Step 2: Convert to fraction form
    74.37/102.66 = 72.30/x
  3. Step 3: Cross multiply
    74.37x = 102.66 × 72.30
  4. Step 4: Simplify right side
    74.37x = 7,422.32
  5. Step 5: Solve for x
    x = 7,422.32/74.37
  6. Step 6: Final answer
    x = 99.80

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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.