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Finding the Fourth Proportional to 840.82, 1,261.32 and 353.98

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Solution

The fourth proportional to 840.82, 1,261.32 and 353.98 is: 531.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.82 : 1,261.32 = 353.98 : x
  2. Step 2: Convert to fraction form
    840.82/1,261.32 = 353.98/x
  3. Step 3: Cross multiply
    840.82x = 1,261.32 × 353.98
  4. Step 4: Simplify right side
    840.82x = 446,482.05
  5. Step 5: Solve for x
    x = 446,482.05/840.82
  6. Step 6: Final answer
    x = 531.01

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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.