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Finding the Fourth Proportional to 644,390.88, 889,234.68 and 357,929.28

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Solution

The fourth proportional to 644,390.88, 889,234.68 and 357,929.28 is: 493,928.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,390.88 : 889,234.68 = 357,929.28 : x
  2. Step 2: Convert to fraction form
    644,390.88/889,234.68 = 357,929.28/x
  3. Step 3: Cross multiply
    644,390.88x = 889,234.68 × 357,929.28
  4. Step 4: Simplify right side
    644,390.88x = 318,283,128,763.43
  5. Step 5: Solve for x
    x = 318,283,128,763.43/644,390.88
  6. Step 6: Final answer
    x = 493,928.67

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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.