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Finding the Fourth Proportional to 210.99, 316.51 and 66.70

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Solution

The fourth proportional to 210.99, 316.51 and 66.70 is: 100.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.99 : 316.51 = 66.70 : x
  2. Step 2: Convert to fraction form
    210.99/316.51 = 66.70/x
  3. Step 3: Cross multiply
    210.99x = 316.51 × 66.70
  4. Step 4: Simplify right side
    210.99x = 21,111.22
  5. Step 5: Solve for x
    x = 21,111.22/210.99
  6. Step 6: Final answer
    x = 100.06

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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.