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Finding the Fourth Proportional to 683.81, 943.60 and 389.08

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Solution

The fourth proportional to 683.81, 943.60 and 389.08 is: 536.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.81 : 943.60 = 389.08 : x
  2. Step 2: Convert to fraction form
    683.81/943.60 = 389.08/x
  3. Step 3: Cross multiply
    683.81x = 943.60 × 389.08
  4. Step 4: Simplify right side
    683.81x = 367,131.18
  5. Step 5: Solve for x
    x = 367,131.18/683.81
  6. Step 6: Final answer
    x = 536.89

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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.