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Finding the Fourth Proportional to 210.93, 316.39 and 89.05

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Solution

The fourth proportional to 210.93, 316.39 and 89.05 is: 133.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.93 : 316.39 = 89.05 : x
  2. Step 2: Convert to fraction form
    210.93/316.39 = 89.05/x
  3. Step 3: Cross multiply
    210.93x = 316.39 × 89.05
  4. Step 4: Simplify right side
    210.93x = 28,174.28
  5. Step 5: Solve for x
    x = 28,174.28/210.93
  6. Step 6: Final answer
    x = 133.57

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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.