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Finding the Fourth Proportional to 405,608.40, 608,412.60 and 343,400.40

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Solution

The fourth proportional to 405,608.40, 608,412.60 and 343,400.40 is: 515,100.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,608.40 : 608,412.60 = 343,400.40 : x
  2. Step 2: Convert to fraction form
    405,608.40/608,412.60 = 343,400.40/x
  3. Step 3: Cross multiply
    405,608.40x = 608,412.60 × 343,400.40
  4. Step 4: Simplify right side
    405,608.40x = 208,929,130,205.04
  5. Step 5: Solve for x
    x = 208,929,130,205.04/405,608.40
  6. Step 6: Final answer
    x = 515,100.60

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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.