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Finding the Fourth Proportional to 158.63, 218.90 and 89.63

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Solution

The fourth proportional to 158.63, 218.90 and 89.63 is: 123.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.63 : 218.90 = 89.63 : x
  2. Step 2: Convert to fraction form
    158.63/218.90 = 89.63/x
  3. Step 3: Cross multiply
    158.63x = 218.90 × 89.63
  4. Step 4: Simplify right side
    158.63x = 19,619.14
  5. Step 5: Solve for x
    x = 19,619.14/158.63
  6. Step 6: Final answer
    x = 123.68

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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.