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Finding the Fourth Proportional to 518,218.60, 775,572.12 and 318,665.36

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Solution

The fourth proportional to 518,218.60, 775,572.12 and 318,665.36 is: 476,918.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,218.60 : 775,572.12 = 318,665.36 : x
  2. Step 2: Convert to fraction form
    518,218.60/775,572.12 = 318,665.36/x
  3. Step 3: Cross multiply
    518,218.60x = 775,572.12 × 318,665.36
  4. Step 4: Simplify right side
    518,218.60x = 247,147,968,825.76
  5. Step 5: Solve for x
    x = 247,147,968,825.76/518,218.60
  6. Step 6: Final answer
    x = 476,918.37

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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.