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Finding the Fourth Proportional to 660,561.21, 911,576.21 and 388,639.35

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Solution

The fourth proportional to 660,561.21, 911,576.21 and 388,639.35 is: 536,323.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,561.21 : 911,576.21 = 388,639.35 : x
  2. Step 2: Convert to fraction form
    660,561.21/911,576.21 = 388,639.35/x
  3. Step 3: Cross multiply
    660,561.21x = 911,576.21 × 388,639.35
  4. Step 4: Simplify right side
    660,561.21x = 354,274,385,729.86
  5. Step 5: Solve for x
    x = 354,274,385,729.86/660,561.21
  6. Step 6: Final answer
    x = 536,323.33

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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.