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Finding the Fourth Proportional to 210.81, 316.30 and 89.16

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Solution

The fourth proportional to 210.81, 316.30 and 89.16 is: 133.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.81 : 316.30 = 89.16 : x
  2. Step 2: Convert to fraction form
    210.81/316.30 = 89.16/x
  3. Step 3: Cross multiply
    210.81x = 316.30 × 89.16
  4. Step 4: Simplify right side
    210.81x = 28,201.09
  5. Step 5: Solve for x
    x = 28,201.09/210.81
  6. Step 6: Final answer
    x = 133.77

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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.