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Finding the Fourth Proportional to 840.78, 1,261.03 and 263.50

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Solution

The fourth proportional to 840.78, 1,261.03 and 263.50 is: 395.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.78 : 1,261.03 = 263.50 : x
  2. Step 2: Convert to fraction form
    840.78/1,261.03 = 263.50/x
  3. Step 3: Cross multiply
    840.78x = 1,261.03 × 263.50
  4. Step 4: Simplify right side
    840.78x = 332,281.41
  5. Step 5: Solve for x
    x = 332,281.41/840.78
  6. Step 6: Final answer
    x = 395.21

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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.