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Finding the Fourth Proportional to 213.71, 320.47 and 83.70

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Solution

The fourth proportional to 213.71, 320.47 and 83.70 is: 125.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.71 : 320.47 = 83.70 : x
  2. Step 2: Convert to fraction form
    213.71/320.47 = 83.70/x
  3. Step 3: Cross multiply
    213.71x = 320.47 × 83.70
  4. Step 4: Simplify right side
    213.71x = 26,823.60
  5. Step 5: Solve for x
    x = 26,823.60/213.71
  6. Step 6: Final answer
    x = 125.52

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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.