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Finding the Fourth Proportional to 840.81, 1,261.62 and 354

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Solution

The fourth proportional to 840.81, 1,261.62 and 354 is: 531.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.81 : 1,261.62 = 354 : x
  2. Step 2: Convert to fraction form
    840.81/1,261.62 = 354/x
  3. Step 3: Cross multiply
    840.81x = 1,261.62 × 354
  4. Step 4: Simplify right side
    840.81x = 446,613.48
  5. Step 5: Solve for x
    x = 446,613.48/840.81
  6. Step 6: Final answer
    x = 531.17

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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.