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Finding the Fourth Proportional to 103.71, 156.47 and 98.65

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Solution

The fourth proportional to 103.71, 156.47 and 98.65 is: 148.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.71 : 156.47 = 98.65 : x
  2. Step 2: Convert to fraction form
    103.71/156.47 = 98.65/x
  3. Step 3: Cross multiply
    103.71x = 156.47 × 98.65
  4. Step 4: Simplify right side
    103.71x = 15,435.77
  5. Step 5: Solve for x
    x = 15,435.77/103.71
  6. Step 6: Final answer
    x = 148.84

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.