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Finding the Fourth Proportional to 839.00, 1,258.31 and 319.05

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Solution

The fourth proportional to 839.00, 1,258.31 and 319.05 is: 478.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.00 : 1,258.31 = 319.05 : x
  2. Step 2: Convert to fraction form
    839.00/1,258.31 = 319.05/x
  3. Step 3: Cross multiply
    839.00x = 1,258.31 × 319.05
  4. Step 4: Simplify right side
    839.00x = 401,462.21
  5. Step 5: Solve for x
    x = 401,462.21/839.00
  6. Step 6: Final answer
    x = 478.50

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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.