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Finding the Fourth Proportional to 840.29, 1,259.89 and 551.39

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Solution

The fourth proportional to 840.29, 1,259.89 and 551.39 is: 826.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.29 : 1,259.89 = 551.39 : x
  2. Step 2: Convert to fraction form
    840.29/1,259.89 = 551.39/x
  3. Step 3: Cross multiply
    840.29x = 1,259.89 × 551.39
  4. Step 4: Simplify right side
    840.29x = 694,683.07
  5. Step 5: Solve for x
    x = 694,683.07/840.29
  6. Step 6: Final answer
    x = 826.72

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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.