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Finding the Fourth Proportional to 647,939.90, 971,909.85 and 412,327.10

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Solution

The fourth proportional to 647,939.90, 971,909.85 and 412,327.10 is: 618,490.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,939.90 : 971,909.85 = 412,327.10 : x
  2. Step 2: Convert to fraction form
    647,939.90/971,909.85 = 412,327.10/x
  3. Step 3: Cross multiply
    647,939.90x = 971,909.85 × 412,327.10
  4. Step 4: Simplify right side
    647,939.90x = 400,744,769,911.94
  5. Step 5: Solve for x
    x = 400,744,769,911.94/647,939.90
  6. Step 6: Final answer
    x = 618,490.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.