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Finding the Fourth Proportional to 406,400.80, 609,601.20 and 378,752.80

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Solution

The fourth proportional to 406,400.80, 609,601.20 and 378,752.80 is: 568,129.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    406,400.80 : 609,601.20 = 378,752.80 : x
  2. Step 2: Convert to fraction form
    406,400.80/609,601.20 = 378,752.80/x
  3. Step 3: Cross multiply
    406,400.80x = 609,601.20 × 378,752.80
  4. Step 4: Simplify right side
    406,400.80x = 230,888,161,383.36
  5. Step 5: Solve for x
    x = 230,888,161,383.36/406,400.80
  6. Step 6: Final answer
    x = 568,129.20

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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.