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Finding the Fourth Proportional to 841.74, 1,261.71 and 347.91

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Solution

The fourth proportional to 841.74, 1,261.71 and 347.91 is: 521.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.74 : 1,261.71 = 347.91 : x
  2. Step 2: Convert to fraction form
    841.74/1,261.71 = 347.91/x
  3. Step 3: Cross multiply
    841.74x = 1,261.71 × 347.91
  4. Step 4: Simplify right side
    841.74x = 438,961.53
  5. Step 5: Solve for x
    x = 438,961.53/841.74
  6. Step 6: Final answer
    x = 521.49

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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.