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Finding the Fourth Proportional to 210.86, 316.33 and 66.59

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Solution

The fourth proportional to 210.86, 316.33 and 66.59 is: 99.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.86 : 316.33 = 66.59 : x
  2. Step 2: Convert to fraction form
    210.86/316.33 = 66.59/x
  3. Step 3: Cross multiply
    210.86x = 316.33 × 66.59
  4. Step 4: Simplify right side
    210.86x = 21,062.67
  5. Step 5: Solve for x
    x = 21,062.67/210.86
  6. Step 6: Final answer
    x = 99.89

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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.