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Finding the Fourth Proportional to 620,389.92, 855,920.06 and 405,655.68

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Solution

The fourth proportional to 620,389.92, 855,920.06 and 405,655.68 is: 559,662.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,389.92 : 855,920.06 = 405,655.68 : x
  2. Step 2: Convert to fraction form
    620,389.92/855,920.06 = 405,655.68/x
  3. Step 3: Cross multiply
    620,389.92x = 855,920.06 × 405,655.68
  4. Step 4: Simplify right side
    620,389.92x = 347,208,833,964.94
  5. Step 5: Solve for x
    x = 347,208,833,964.94/620,389.92
  6. Step 6: Final answer
    x = 559,662.27

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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.