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Finding the Fourth Proportional to 683.69, 943.40 and 388.95

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Solution

The fourth proportional to 683.69, 943.40 and 388.95 is: 536.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.69 : 943.40 = 388.95 : x
  2. Step 2: Convert to fraction form
    683.69/943.40 = 388.95/x
  3. Step 3: Cross multiply
    683.69x = 943.40 × 388.95
  4. Step 4: Simplify right side
    683.69x = 366,933.49
  5. Step 5: Solve for x
    x = 366,933.49/683.69
  6. Step 6: Final answer
    x = 536.70

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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.