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Finding the Fourth Proportional to 492,676.12, 679,893.55 and 288,686.43

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Solution

The fourth proportional to 492,676.12, 679,893.55 and 288,686.43 is: 398,387.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    492,676.12 : 679,893.55 = 288,686.43 : x
  2. Step 2: Convert to fraction form
    492,676.12/679,893.55 = 288,686.43/x
  3. Step 3: Cross multiply
    492,676.12x = 679,893.55 × 288,686.43
  4. Step 4: Simplify right side
    492,676.12x = 196,276,041,007.81
  5. Step 5: Solve for x
    x = 196,276,041,007.81/492,676.12
  6. Step 6: Final answer
    x = 398,387.57

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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.