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Finding the Fourth Proportional to 660,823.88, 911,919.21 and 388,907.78

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Solution

The fourth proportional to 660,823.88, 911,919.21 and 388,907.78 is: 536,682.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,823.88 : 911,919.21 = 388,907.78 : x
  2. Step 2: Convert to fraction form
    660,823.88/911,919.21 = 388,907.78/x
  3. Step 3: Cross multiply
    660,823.88x = 911,919.21 × 388,907.78
  4. Step 4: Simplify right side
    660,823.88x = 354,652,475,500.45
  5. Step 5: Solve for x
    x = 354,652,475,500.45/660,823.88
  6. Step 6: Final answer
    x = 536,682.29

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1.5x scale

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.