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Finding the Fourth Proportional to 931.88, 1,285.39 and 683.21

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Solution

The fourth proportional to 931.88, 1,285.39 and 683.21 is: 942.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.88 : 1,285.39 = 683.21 : x
  2. Step 2: Convert to fraction form
    931.88/1,285.39 = 683.21/x
  3. Step 3: Cross multiply
    931.88x = 1,285.39 × 683.21
  4. Step 4: Simplify right side
    931.88x = 878,191.30
  5. Step 5: Solve for x
    x = 878,191.30/931.88
  6. Step 6: Final answer
    x = 942.39

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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.