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Finding the Fourth Proportional to 839.79, 1,259.69 and 262.71

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Solution

The fourth proportional to 839.79, 1,259.69 and 262.71 is: 394.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.79 : 1,259.69 = 262.71 : x
  2. Step 2: Convert to fraction form
    839.79/1,259.69 = 262.71/x
  3. Step 3: Cross multiply
    839.79x = 1,259.69 × 262.71
  4. Step 4: Simplify right side
    839.79x = 330,931.85
  5. Step 5: Solve for x
    x = 330,931.85/839.79
  6. Step 6: Final answer
    x = 394.07

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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.