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Finding the Fourth Proportional to 398,051.55, 550,010.25 and 318,138.57

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Solution

The fourth proportional to 398,051.55, 550,010.25 and 318,138.57 is: 439,589.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,051.55 : 550,010.25 = 318,138.57 : x
  2. Step 2: Convert to fraction form
    398,051.55/550,010.25 = 318,138.57/x
  3. Step 3: Cross multiply
    398,051.55x = 550,010.25 × 318,138.57
  4. Step 4: Simplify right side
    398,051.55x = 174,979,474,420.34
  5. Step 5: Solve for x
    x = 174,979,474,420.34/398,051.55
  6. Step 6: Final answer
    x = 439,589.98

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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.