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Finding the Fourth Proportional to 841.82, 1,261.98 and 355.21

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Solution

The fourth proportional to 841.82, 1,261.98 and 355.21 is: 532.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.82 : 1,261.98 = 355.21 : x
  2. Step 2: Convert to fraction form
    841.82/1,261.98 = 355.21/x
  3. Step 3: Cross multiply
    841.82x = 1,261.98 × 355.21
  4. Step 4: Simplify right side
    841.82x = 448,264.76
  5. Step 5: Solve for x
    x = 448,264.76/841.82
  6. Step 6: Final answer
    x = 532.50

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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.