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Finding the Fourth Proportional to 152.98, 210.96 and 103.78

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Solution

The fourth proportional to 152.98, 210.96 and 103.78 is: 143.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.98 : 210.96 = 103.78 : x
  2. Step 2: Convert to fraction form
    152.98/210.96 = 103.78/x
  3. Step 3: Cross multiply
    152.98x = 210.96 × 103.78
  4. Step 4: Simplify right side
    152.98x = 21,893.43
  5. Step 5: Solve for x
    x = 21,893.43/152.98
  6. Step 6: Final answer
    x = 143.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.