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Finding the Fourth Proportional to 620,404.42, 855,940.08 and 405,670.18

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Solution

The fourth proportional to 620,404.42, 855,940.08 and 405,670.18 is: 559,682.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,404.42 : 855,940.08 = 405,670.18 : x
  2. Step 2: Convert to fraction form
    620,404.42/855,940.08 = 405,670.18/x
  3. Step 3: Cross multiply
    620,404.42x = 855,940.08 × 405,670.18
  4. Step 4: Simplify right side
    620,404.42x = 347,229,366,322.81
  5. Step 5: Solve for x
    x = 347,229,366,322.81/620,404.42
  6. Step 6: Final answer
    x = 559,682.29

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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.