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Finding the Fourth Proportional to 660,229.70, 911,120.72 and 388,309.05

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Solution

The fourth proportional to 660,229.70, 911,120.72 and 388,309.05 is: 535,868.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,229.70 : 911,120.72 = 388,309.05 : x
  2. Step 2: Convert to fraction form
    660,229.70/911,120.72 = 388,309.05/x
  3. Step 3: Cross multiply
    660,229.70x = 911,120.72 × 388,309.05
  4. Step 4: Simplify right side
    660,229.70x = 353,796,419,276.97
  5. Step 5: Solve for x
    x = 353,796,419,276.97/660,229.70
  6. Step 6: Final answer
    x = 535,868.69

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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.