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Finding the Fourth Proportional to 154.78, 213.60 and 89.30

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Solution

The fourth proportional to 154.78, 213.60 and 89.30 is: 123.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.78 : 213.60 = 89.30 : x
  2. Step 2: Convert to fraction form
    154.78/213.60 = 89.30/x
  3. Step 3: Cross multiply
    154.78x = 213.60 × 89.30
  4. Step 4: Simplify right side
    154.78x = 19,075.35
  5. Step 5: Solve for x
    x = 19,075.35/154.78
  6. Step 6: Final answer
    x = 123.24

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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.