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Finding the Fourth Proportional to 208,619.20, 312,928.80 and 200,454.40

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Solution

The fourth proportional to 208,619.20, 312,928.80 and 200,454.40 is: 300,681.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,619.20 : 312,928.80 = 200,454.40 : x
  2. Step 2: Convert to fraction form
    208,619.20/312,928.80 = 200,454.40/x
  3. Step 3: Cross multiply
    208,619.20x = 312,928.80 × 200,454.40
  4. Step 4: Simplify right side
    208,619.20x = 62,727,954,846.72
  5. Step 5: Solve for x
    x = 62,727,954,846.72/208,619.20
  6. Step 6: Final answer
    x = 300,681.60

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1.5x scale

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.