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Finding the Fourth Proportional to 745,137, 1,028,289.18 and 405,607.80

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Solution

The fourth proportional to 745,137, 1,028,289.18 and 405,607.80 is: 559,738.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    745,137 : 1,028,289.18 = 405,607.80 : x
  2. Step 2: Convert to fraction form
    745,137/1,028,289.18 = 405,607.80/x
  3. Step 3: Cross multiply
    745,137x = 1,028,289.18 × 405,607.80
  4. Step 4: Simplify right side
    745,137x = 417,082,112,063.60
  5. Step 5: Solve for x
    x = 417,082,112,063.60/745,137
  6. Step 6: Final answer
    x = 559,738.83

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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.