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Finding the Fourth Proportional to 842.81, 1,263.93 and 322.79

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Solution

The fourth proportional to 842.81, 1,263.93 and 322.79 is: 484.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.81 : 1,263.93 = 322.79 : x
  2. Step 2: Convert to fraction form
    842.81/1,263.93 = 322.79/x
  3. Step 3: Cross multiply
    842.81x = 1,263.93 × 322.79
  4. Step 4: Simplify right side
    842.81x = 407,977.65
  5. Step 5: Solve for x
    x = 407,977.65/842.81
  6. Step 6: Final answer
    x = 484.07

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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.