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Finding the Fourth Proportional to 840.76, 1,259.49 and 551.32

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Solution

The fourth proportional to 840.76, 1,259.49 and 551.32 is: 825.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.76 : 1,259.49 = 551.32 : x
  2. Step 2: Convert to fraction form
    840.76/1,259.49 = 551.32/x
  3. Step 3: Cross multiply
    840.76x = 1,259.49 × 551.32
  4. Step 4: Simplify right side
    840.76x = 694,382.03
  5. Step 5: Solve for x
    x = 694,382.03/840.76
  6. Step 6: Final answer
    x = 825.90

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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.