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Finding the Fourth Proportional to 840.29, 1,260.36 and 401.22

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Solution

The fourth proportional to 840.29, 1,260.36 and 401.22 is: 601.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.29 : 1,260.36 = 401.22 : x
  2. Step 2: Convert to fraction form
    840.29/1,260.36 = 401.22/x
  3. Step 3: Cross multiply
    840.29x = 1,260.36 × 401.22
  4. Step 4: Simplify right side
    840.29x = 505,681.64
  5. Step 5: Solve for x
    x = 505,681.64/840.29
  6. Step 6: Final answer
    x = 601.80

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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.