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Finding the Fourth Proportional to 842.78, 1,263.74 and 534.39

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Solution

The fourth proportional to 842.78, 1,263.74 and 534.39 is: 801.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.78 : 1,263.74 = 534.39 : x
  2. Step 2: Convert to fraction form
    842.78/1,263.74 = 534.39/x
  3. Step 3: Cross multiply
    842.78x = 1,263.74 × 534.39
  4. Step 4: Simplify right side
    842.78x = 675,330.02
  5. Step 5: Solve for x
    x = 675,330.02/842.78
  6. Step 6: Final answer
    x = 801.31

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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.