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Finding the Fourth Proportional to 931.35, 1,285.21 and 683.71

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Solution

The fourth proportional to 931.35, 1,285.21 and 683.71 is: 943.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.35 : 1,285.21 = 683.71 : x
  2. Step 2: Convert to fraction form
    931.35/1,285.21 = 683.71/x
  3. Step 3: Cross multiply
    931.35x = 1,285.21 × 683.71
  4. Step 4: Simplify right side
    931.35x = 878,710.93
  5. Step 5: Solve for x
    x = 878,710.93/931.35
  6. Step 6: Final answer
    x = 943.48

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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.