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Finding the Fourth Proportional to 210.88, 316.32 and 66.61

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Solution

The fourth proportional to 210.88, 316.32 and 66.61 is: 99.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.88 : 316.32 = 66.61 : x
  2. Step 2: Convert to fraction form
    210.88/316.32 = 66.61/x
  3. Step 3: Cross multiply
    210.88x = 316.32 × 66.61
  4. Step 4: Simplify right side
    210.88x = 21,068.49
  5. Step 5: Solve for x
    x = 21,068.49/210.88
  6. Step 6: Final answer
    x = 99.91

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.