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Finding the Fourth Proportional to 839.39, 1,259.08 and 319.52

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Solution

The fourth proportional to 839.39, 1,259.08 and 319.52 is: 479.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.39 : 1,259.08 = 319.52 : x
  2. Step 2: Convert to fraction form
    839.39/1,259.08 = 319.52/x
  3. Step 3: Cross multiply
    839.39x = 1,259.08 × 319.52
  4. Step 4: Simplify right side
    839.39x = 402,303.59
  5. Step 5: Solve for x
    x = 402,303.59/839.39
  6. Step 6: Final answer
    x = 479.28

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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.