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Finding the Fourth Proportional to 839.64, 1,258.53 and 319.14

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Solution

The fourth proportional to 839.64, 1,258.53 and 319.14 is: 478.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.64 : 1,258.53 = 319.14 : x
  2. Step 2: Convert to fraction form
    839.64/1,258.53 = 319.14/x
  3. Step 3: Cross multiply
    839.64x = 1,258.53 × 319.14
  4. Step 4: Simplify right side
    839.64x = 401,647.26
  5. Step 5: Solve for x
    x = 401,647.26/839.64
  6. Step 6: Final answer
    x = 478.36

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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.