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Finding the Fourth Proportional to 683.66, 943.70 and 421.70

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Solution

The fourth proportional to 683.66, 943.70 and 421.70 is: 582.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.66 : 943.70 = 421.70 : x
  2. Step 2: Convert to fraction form
    683.66/943.70 = 421.70/x
  3. Step 3: Cross multiply
    683.66x = 943.70 × 421.70
  4. Step 4: Simplify right side
    683.66x = 397,951.46
  5. Step 5: Solve for x
    x = 397,951.46/683.66
  6. Step 6: Final answer
    x = 582.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.