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Finding the Fourth Proportional to 643,404.10, 965,720.55 and 550,015.30

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Solution

The fourth proportional to 643,404.10, 965,720.55 and 550,015.30 is: 825,548.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,404.10 : 965,720.55 = 550,015.30 : x
  2. Step 2: Convert to fraction form
    643,404.10/965,720.55 = 550,015.30/x
  3. Step 3: Cross multiply
    643,404.10x = 965,720.55 × 550,015.30
  4. Step 4: Simplify right side
    643,404.10x = 531,161,078,024.42
  5. Step 5: Solve for x
    x = 531,161,078,024.42/643,404.10
  6. Step 6: Final answer
    x = 825,548.17

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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.