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Finding the Fourth Proportional to 210.30, 289.86 and 144.66

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Solution

The fourth proportional to 210.30, 289.86 and 144.66 is: 199.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.30 : 289.86 = 144.66 : x
  2. Step 2: Convert to fraction form
    210.30/289.86 = 144.66/x
  3. Step 3: Cross multiply
    210.30x = 289.86 × 144.66
  4. Step 4: Simplify right side
    210.30x = 41,931.15
  5. Step 5: Solve for x
    x = 41,931.15/210.30
  6. Step 6: Final answer
    x = 199.39

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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.