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Finding the Fourth Proportional to 189.75, 284.08 and 144.28

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Solution

The fourth proportional to 189.75, 284.08 and 144.28 is: 216.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.75 : 284.08 = 144.28 : x
  2. Step 2: Convert to fraction form
    189.75/284.08 = 144.28/x
  3. Step 3: Cross multiply
    189.75x = 284.08 × 144.28
  4. Step 4: Simplify right side
    189.75x = 40,987.06
  5. Step 5: Solve for x
    x = 40,987.06/189.75
  6. Step 6: Final answer
    x = 216.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.