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Finding the Fourth Proportional to 620,239.80, 856,023.47 and 378,662.43

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Solution

The fourth proportional to 620,239.80, 856,023.47 and 378,662.43 is: 522,610.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,239.80 : 856,023.47 = 378,662.43 : x
  2. Step 2: Convert to fraction form
    620,239.80/856,023.47 = 378,662.43/x
  3. Step 3: Cross multiply
    620,239.80x = 856,023.47 × 378,662.43
  4. Step 4: Simplify right side
    620,239.80x = 324,143,927,287.23
  5. Step 5: Solve for x
    x = 324,143,927,287.23/620,239.80
  6. Step 6: Final answer
    x = 522,610.65

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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.