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Finding the Fourth Proportional to 839.99, 1,259.99 and 320.23

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Solution

The fourth proportional to 839.99, 1,259.99 and 320.23 is: 480.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.99 : 1,259.99 = 320.23 : x
  2. Step 2: Convert to fraction form
    839.99/1,259.99 = 320.23/x
  3. Step 3: Cross multiply
    839.99x = 1,259.99 × 320.23
  4. Step 4: Simplify right side
    839.99x = 403,484.25
  5. Step 5: Solve for x
    x = 403,484.25/839.99
  6. Step 6: Final answer
    x = 480.35

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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.