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Finding the Fourth Proportional to 912.53, 1,259.78 and 712.94

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Solution

The fourth proportional to 912.53, 1,259.78 and 712.94 is: 984.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.53 : 1,259.78 = 712.94 : x
  2. Step 2: Convert to fraction form
    912.53/1,259.78 = 712.94/x
  3. Step 3: Cross multiply
    912.53x = 1,259.78 × 712.94
  4. Step 4: Simplify right side
    912.53x = 898,137.69
  5. Step 5: Solve for x
    x = 898,137.69/912.53
  6. Step 6: Final answer
    x = 984.23

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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.