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Finding the Fourth Proportional to 939,133, 1,408,422.45 and 399,388.26

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Solution

The fourth proportional to 939,133, 1,408,422.45 and 399,388.26 is: 598,964.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    939,133 : 1,408,422.45 = 399,388.26 : x
  2. Step 2: Convert to fraction form
    939,133/1,408,422.45 = 399,388.26/x
  3. Step 3: Cross multiply
    939,133x = 1,408,422.45 × 399,388.26
  4. Step 4: Simplify right side
    939,133x = 562,507,391,650.44
  5. Step 5: Solve for x
    x = 562,507,391,650.44/939,133
  6. Step 6: Final answer
    x = 598,964.57

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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.