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Finding the Fourth Proportional to 394,688.02, 544,248.90 and 318,126.64

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Solution

The fourth proportional to 394,688.02, 544,248.90 and 318,126.64 is: 438,675.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,688.02 : 544,248.90 = 318,126.64 : x
  2. Step 2: Convert to fraction form
    394,688.02/544,248.90 = 318,126.64/x
  3. Step 3: Cross multiply
    394,688.02x = 544,248.90 × 318,126.64
  4. Step 4: Simplify right side
    394,688.02x = 173,140,073,880.70
  5. Step 5: Solve for x
    x = 173,140,073,880.70/394,688.02
  6. Step 6: Final answer
    x = 438,675.78

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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.