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Finding the Fourth Proportional to 394,531, 544,454.70 and 215,683

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Solution

The fourth proportional to 394,531, 544,454.70 and 215,683 is: 297,643.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,531 : 544,454.70 = 215,683 : x
  2. Step 2: Convert to fraction form
    394,531/544,454.70 = 215,683/x
  3. Step 3: Cross multiply
    394,531x = 544,454.70 × 215,683
  4. Step 4: Simplify right side
    394,531x = 117,429,623,060.10
  5. Step 5: Solve for x
    x = 117,429,623,060.10/394,531
  6. Step 6: Final answer
    x = 297,643.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.