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Finding the Fourth Proportional to 931.96, 1,286.40 and 637.12

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Solution

The fourth proportional to 931.96, 1,286.40 and 637.12 is: 879.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.96 : 1,286.40 = 637.12 : x
  2. Step 2: Convert to fraction form
    931.96/1,286.40 = 637.12/x
  3. Step 3: Cross multiply
    931.96x = 1,286.40 × 637.12
  4. Step 4: Simplify right side
    931.96x = 819,591.17
  5. Step 5: Solve for x
    x = 819,591.17/931.96
  6. Step 6: Final answer
    x = 879.43

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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.