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Finding the Fourth Proportional to 841.77, 1,261.71 and 379.80

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Solution

The fourth proportional to 841.77, 1,261.71 and 379.80 is: 569.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.77 : 1,261.71 = 379.80 : x
  2. Step 2: Convert to fraction form
    841.77/1,261.71 = 379.80/x
  3. Step 3: Cross multiply
    841.77x = 1,261.71 × 379.80
  4. Step 4: Simplify right side
    841.77x = 479,197.46
  5. Step 5: Solve for x
    x = 479,197.46/841.77
  6. Step 6: Final answer
    x = 569.27

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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.