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Finding the Fourth Proportional to 103.84, 155.04 and 98.56

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Solution

The fourth proportional to 103.84, 155.04 and 98.56 is: 147.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.84 : 155.04 = 98.56 : x
  2. Step 2: Convert to fraction form
    103.84/155.04 = 98.56/x
  3. Step 3: Cross multiply
    103.84x = 155.04 × 98.56
  4. Step 4: Simplify right side
    103.84x = 15,280.74
  5. Step 5: Solve for x
    x = 15,280.74/103.84
  6. Step 6: Final answer
    x = 147.16

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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.