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Finding the Fourth Proportional to 683.79, 943.65 and 389.06

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Solution

The fourth proportional to 683.79, 943.65 and 389.06 is: 536.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.79 : 943.65 = 389.06 : x
  2. Step 2: Convert to fraction form
    683.79/943.65 = 389.06/x
  3. Step 3: Cross multiply
    683.79x = 943.65 × 389.06
  4. Step 4: Simplify right side
    683.79x = 367,131.75
  5. Step 5: Solve for x
    x = 367,131.75/683.79
  6. Step 6: Final answer
    x = 536.91

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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.