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Finding the Fourth Proportional to 840.85, 1,261.15 and 531.77

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Solution

The fourth proportional to 840.85, 1,261.15 and 531.77 is: 797.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.85 : 1,261.15 = 531.77 : x
  2. Step 2: Convert to fraction form
    840.85/1,261.15 = 531.77/x
  3. Step 3: Cross multiply
    840.85x = 1,261.15 × 531.77
  4. Step 4: Simplify right side
    840.85x = 670,641.74
  5. Step 5: Solve for x
    x = 670,641.74/840.85
  6. Step 6: Final answer
    x = 797.58

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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.