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Finding the Fourth Proportional to 210.71, 316.02 and 66.40

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Solution

The fourth proportional to 210.71, 316.02 and 66.40 is: 99.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.71 : 316.02 = 66.40 : x
  2. Step 2: Convert to fraction form
    210.71/316.02 = 66.40/x
  3. Step 3: Cross multiply
    210.71x = 316.02 × 66.40
  4. Step 4: Simplify right side
    210.71x = 20,982.15
  5. Step 5: Solve for x
    x = 20,982.15/210.71
  6. Step 6: Final answer
    x = 99.58

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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.