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Finding the Fourth Proportional to 74.02, 110.29 and 67.20

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Solution

The fourth proportional to 74.02, 110.29 and 67.20 is: 100.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.02 : 110.29 = 67.20 : x
  2. Step 2: Convert to fraction form
    74.02/110.29 = 67.20/x
  3. Step 3: Cross multiply
    74.02x = 110.29 × 67.20
  4. Step 4: Simplify right side
    74.02x = 7,411.49
  5. Step 5: Solve for x
    x = 7,411.49/74.02
  6. Step 6: Final answer
    x = 100.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.