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Finding the Fourth Proportional to 912.89, 1,368.43 and 425.99

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Solution

The fourth proportional to 912.89, 1,368.43 and 425.99 is: 638.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.89 : 1,368.43 = 425.99 : x
  2. Step 2: Convert to fraction form
    912.89/1,368.43 = 425.99/x
  3. Step 3: Cross multiply
    912.89x = 1,368.43 × 425.99
  4. Step 4: Simplify right side
    912.89x = 582,939.85
  5. Step 5: Solve for x
    x = 582,939.85/912.89
  6. Step 6: Final answer
    x = 638.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.