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Finding the Fourth Proportional to 644,245.21, 888,915.22 and 389,590.93

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Solution

The fourth proportional to 644,245.21, 888,915.22 and 389,590.93 is: 537,548.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,245.21 : 888,915.22 = 389,590.93 : x
  2. Step 2: Convert to fraction form
    644,245.21/888,915.22 = 389,590.93/x
  3. Step 3: Cross multiply
    644,245.21x = 888,915.22 × 389,590.93
  4. Step 4: Simplify right side
    644,245.21x = 346,313,307,250.96
  5. Step 5: Solve for x
    x = 346,313,307,250.96/644,245.21
  6. Step 6: Final answer
    x = 537,548.91

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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.