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Finding the Fourth Proportional to 620,410.18, 855,948 and 405,675.94

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Solution

The fourth proportional to 620,410.18, 855,948 and 405,675.94 is: 559,690.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,410.18 : 855,948 = 405,675.94 : x
  2. Step 2: Convert to fraction form
    620,410.18/855,948 = 405,675.94/x
  3. Step 3: Cross multiply
    620,410.18x = 855,948 × 405,675.94
  4. Step 4: Simplify right side
    620,410.18x = 347,237,509,491.12
  5. Step 5: Solve for x
    x = 347,237,509,491.12/620,410.18
  6. Step 6: Final answer
    x = 559,690.22

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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.