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Finding the Fourth Proportional to 74.74, 111.56 and 65.18

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Solution

The fourth proportional to 74.74, 111.56 and 65.18 is: 97.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.74 : 111.56 = 65.18 : x
  2. Step 2: Convert to fraction form
    74.74/111.56 = 65.18/x
  3. Step 3: Cross multiply
    74.74x = 111.56 × 65.18
  4. Step 4: Simplify right side
    74.74x = 7,271.48
  5. Step 5: Solve for x
    x = 7,271.48/74.74
  6. Step 6: Final answer
    x = 97.29

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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.