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Finding the Fourth Proportional to 716,699.75, 989,045.81 and 394,409.85

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Solution

The fourth proportional to 716,699.75, 989,045.81 and 394,409.85 is: 544,285.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,699.75 : 989,045.81 = 394,409.85 : x
  2. Step 2: Convert to fraction form
    716,699.75/989,045.81 = 394,409.85/x
  3. Step 3: Cross multiply
    716,699.75x = 989,045.81 × 394,409.85
  4. Step 4: Simplify right side
    716,699.75x = 390,089,407,593.18
  5. Step 5: Solve for x
    x = 390,089,407,593.18/716,699.75
  6. Step 6: Final answer
    x = 544,285.68

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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.