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Finding the Fourth Proportional to 683.65, 943.45 and 388.92

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Solution

The fourth proportional to 683.65, 943.45 and 388.92 is: 536.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.65 : 943.45 = 388.92 : x
  2. Step 2: Convert to fraction form
    683.65/943.45 = 388.92/x
  3. Step 3: Cross multiply
    683.65x = 943.45 × 388.92
  4. Step 4: Simplify right side
    683.65x = 366,926.57
  5. Step 5: Solve for x
    x = 366,926.57/683.65
  6. Step 6: Final answer
    x = 536.72

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Double scale
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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.