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Finding the Fourth Proportional to 103.71, 155.49 and 52.35

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Solution

The fourth proportional to 103.71, 155.49 and 52.35 is: 78.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.71 : 155.49 = 52.35 : x
  2. Step 2: Convert to fraction form
    103.71/155.49 = 52.35/x
  3. Step 3: Cross multiply
    103.71x = 155.49 × 52.35
  4. Step 4: Simplify right side
    103.71x = 8,139.90
  5. Step 5: Solve for x
    x = 8,139.90/103.71
  6. Step 6: Final answer
    x = 78.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.