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Finding the Fourth Proportional to 153.99, 212.40 and 112.55

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Solution

The fourth proportional to 153.99, 212.40 and 112.55 is: 155.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.99 : 212.40 = 112.55 : x
  2. Step 2: Convert to fraction form
    153.99/212.40 = 112.55/x
  3. Step 3: Cross multiply
    153.99x = 212.40 × 112.55
  4. Step 4: Simplify right side
    153.99x = 23,904.56
  5. Step 5: Solve for x
    x = 23,904.56/153.99
  6. Step 6: Final answer
    x = 155.23

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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.