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Finding the Fourth Proportional to 210.91, 316.35 and 66.63

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Solution

The fourth proportional to 210.91, 316.35 and 66.63 is: 99.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.91 : 316.35 = 66.63 : x
  2. Step 2: Convert to fraction form
    210.91/316.35 = 66.63/x
  3. Step 3: Cross multiply
    210.91x = 316.35 × 66.63
  4. Step 4: Simplify right side
    210.91x = 21,078.40
  5. Step 5: Solve for x
    x = 21,078.40/210.91
  6. Step 6: Final answer
    x = 99.94

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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.