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Finding the Fourth Proportional to 912.67, 1,258.39 and 633.15

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Solution

The fourth proportional to 912.67, 1,258.39 and 633.15 is: 872.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.67 : 1,258.39 = 633.15 : x
  2. Step 2: Convert to fraction form
    912.67/1,258.39 = 633.15/x
  3. Step 3: Cross multiply
    912.67x = 1,258.39 × 633.15
  4. Step 4: Simplify right side
    912.67x = 796,749.63
  5. Step 5: Solve for x
    x = 796,749.63/912.67
  6. Step 6: Final answer
    x = 872.99

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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.