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Finding the Fourth Proportional to 683.88, 943.80 and 385.20

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Solution

The fourth proportional to 683.88, 943.80 and 385.20 is: 531.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.88 : 943.80 = 385.20 : x
  2. Step 2: Convert to fraction form
    683.88/943.80 = 385.20/x
  3. Step 3: Cross multiply
    683.88x = 943.80 × 385.20
  4. Step 4: Simplify right side
    683.88x = 363,551.76
  5. Step 5: Solve for x
    x = 363,551.76/683.88
  6. Step 6: Final answer
    x = 531.60

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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.