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Finding the Fourth Proportional to 841.06, 1,261.63 and 320.89

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Solution

The fourth proportional to 841.06, 1,261.63 and 320.89 is: 481.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.06 : 1,261.63 = 320.89 : x
  2. Step 2: Convert to fraction form
    841.06/1,261.63 = 320.89/x
  3. Step 3: Cross multiply
    841.06x = 1,261.63 × 320.89
  4. Step 4: Simplify right side
    841.06x = 404,844.45
  5. Step 5: Solve for x
    x = 404,844.45/841.06
  6. Step 6: Final answer
    x = 481.35

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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.