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Finding the Fourth Proportional to 716,321.78, 988,518.52 and 394,024.80

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Solution

The fourth proportional to 716,321.78, 988,518.52 and 394,024.80 is: 543,751.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,321.78 : 988,518.52 = 394,024.80 : x
  2. Step 2: Convert to fraction form
    716,321.78/988,518.52 = 394,024.80/x
  3. Step 3: Cross multiply
    716,321.78x = 988,518.52 × 394,024.80
  4. Step 4: Simplify right side
    716,321.78x = 389,500,812,139.30
  5. Step 5: Solve for x
    x = 389,500,812,139.30/716,321.78
  6. Step 6: Final answer
    x = 543,751.18

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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.