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Finding the Fourth Proportional to 842.19, 1,263.50 and 495.81

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Solution

The fourth proportional to 842.19, 1,263.50 and 495.81 is: 743.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.19 : 1,263.50 = 495.81 : x
  2. Step 2: Convert to fraction form
    842.19/1,263.50 = 495.81/x
  3. Step 3: Cross multiply
    842.19x = 1,263.50 × 495.81
  4. Step 4: Simplify right side
    842.19x = 626,455.94
  5. Step 5: Solve for x
    x = 626,455.94/842.19
  6. Step 6: Final answer
    x = 743.84

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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.