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Finding the Fourth Proportional to 155.09, 213.64 and 113.53

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Solution

The fourth proportional to 155.09, 213.64 and 113.53 is: 156.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.09 : 213.64 = 113.53 : x
  2. Step 2: Convert to fraction form
    155.09/213.64 = 113.53/x
  3. Step 3: Cross multiply
    155.09x = 213.64 × 113.53
  4. Step 4: Simplify right side
    155.09x = 24,254.55
  5. Step 5: Solve for x
    x = 24,254.55/155.09
  6. Step 6: Final answer
    x = 156.39

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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.