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Finding the Fourth Proportional to 210.70, 316.08 and 66.46

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Solution

The fourth proportional to 210.70, 316.08 and 66.46 is: 99.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.70 : 316.08 = 66.46 : x
  2. Step 2: Convert to fraction form
    210.70/316.08 = 66.46/x
  3. Step 3: Cross multiply
    210.70x = 316.08 × 66.46
  4. Step 4: Simplify right side
    210.70x = 21,006.68
  5. Step 5: Solve for x
    x = 21,006.68/210.70
  6. Step 6: Final answer
    x = 99.70

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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.