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Finding the Fourth Proportional to 644,622.62, 889,606.90 and 358,142.72

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Solution

The fourth proportional to 644,622.62, 889,606.90 and 358,142.72 is: 494,252.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,622.62 : 889,606.90 = 358,142.72 : x
  2. Step 2: Convert to fraction form
    644,622.62/889,606.90 = 358,142.72/x
  3. Step 3: Cross multiply
    644,622.62x = 889,606.90 × 358,142.72
  4. Step 4: Simplify right side
    644,622.62x = 318,606,230,448.73
  5. Step 5: Solve for x
    x = 318,606,230,448.73/644,622.62
  6. Step 6: Final answer
    x = 494,252.33

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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.