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Finding the Fourth Proportional to 839.42, 1,258.99 and 400.94

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Solution

The fourth proportional to 839.42, 1,258.99 and 400.94 is: 601.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.42 : 1,258.99 = 400.94 : x
  2. Step 2: Convert to fraction form
    839.42/1,258.99 = 400.94/x
  3. Step 3: Cross multiply
    839.42x = 1,258.99 × 400.94
  4. Step 4: Simplify right side
    839.42x = 504,779.45
  5. Step 5: Solve for x
    x = 504,779.45/839.42
  6. Step 6: Final answer
    x = 601.34

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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.