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Finding the Fourth Proportional to 1,243.21, 1,715.60 and 683.68

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Solution

The fourth proportional to 1,243.21, 1,715.60 and 683.68 is: 943.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.21 : 1,715.60 = 683.68 : x
  2. Step 2: Convert to fraction form
    1,243.21/1,715.60 = 683.68/x
  3. Step 3: Cross multiply
    1,243.21x = 1,715.60 × 683.68
  4. Step 4: Simplify right side
    1,243.21x = 1,172,921.41
  5. Step 5: Solve for x
    x = 1,172,921.41/1,243.21
  6. Step 6: Final answer
    x = 943.46

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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.