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Finding the Fourth Proportional to 717,193.57, 989,748.90 and 394,915.20

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Solution

The fourth proportional to 717,193.57, 989,748.90 and 394,915.20 is: 544,994.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,193.57 : 989,748.90 = 394,915.20 : x
  2. Step 2: Convert to fraction form
    717,193.57/989,748.90 = 394,915.20/x
  3. Step 3: Cross multiply
    717,193.57x = 989,748.90 × 394,915.20
  4. Step 4: Simplify right side
    717,193.57x = 390,866,885,780.57
  5. Step 5: Solve for x
    x = 390,866,885,780.57/717,193.57
  6. Step 6: Final answer
    x = 544,994.97

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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.