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Finding the Fourth Proportional to 408,085.70, 612,128.55 and 408,085.70

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Solution

The fourth proportional to 408,085.70, 612,128.55 and 408,085.70 is: 612,128.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,085.70 : 612,128.55 = 408,085.70 : x
  2. Step 2: Convert to fraction form
    408,085.70/612,128.55 = 408,085.70/x
  3. Step 3: Cross multiply
    408,085.70x = 612,128.55 × 408,085.70
  4. Step 4: Simplify right side
    408,085.70x = 249,800,907,816.74
  5. Step 5: Solve for x
    x = 249,800,907,816.74/408,085.70
  6. Step 6: Final answer
    x = 612,128.55

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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.