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Finding the Fourth Proportional to 155.03, 213.86 and 89.49

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Solution

The fourth proportional to 155.03, 213.86 and 89.49 is: 123.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.03 : 213.86 = 89.49 : x
  2. Step 2: Convert to fraction form
    155.03/213.86 = 89.49/x
  3. Step 3: Cross multiply
    155.03x = 213.86 × 89.49
  4. Step 4: Simplify right side
    155.03x = 19,137.88
  5. Step 5: Solve for x
    x = 19,137.88/155.03
  6. Step 6: Final answer
    x = 123.45

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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.