Home / 643,511.60-887,917.32-388,876.40

Finding the Fourth Proportional to 643,511.60, 887,917.32 and 388,876.40

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Solution

The fourth proportional to 643,511.60, 887,917.32 and 388,876.40 is: 536,571.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,511.60 : 887,917.32 = 388,876.40 : x
  2. Step 2: Convert to fraction form
    643,511.60/887,917.32 = 388,876.40/x
  3. Step 3: Cross multiply
    643,511.60x = 887,917.32 × 388,876.40
  4. Step 4: Simplify right side
    643,511.60x = 345,290,090,899.25
  5. Step 5: Solve for x
    x = 345,290,090,899.25/643,511.60
  6. Step 6: Final answer
    x = 536,571.67

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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.