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Finding the Fourth Proportional to 716,408.61, 988,604.85 and 394,066.68

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Solution

The fourth proportional to 716,408.61, 988,604.85 and 394,066.68 is: 543,790.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,408.61 : 988,604.85 = 394,066.68 : x
  2. Step 2: Convert to fraction form
    716,408.61/988,604.85 = 394,066.68/x
  3. Step 3: Cross multiply
    716,408.61x = 988,604.85 × 394,066.68
  4. Step 4: Simplify right side
    716,408.61x = 389,576,231,071.40
  5. Step 5: Solve for x
    x = 389,576,231,071.40/716,408.61
  6. Step 6: Final answer
    x = 543,790.55

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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.