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Finding the Fourth Proportional to 518,212.05, 775,562.40 and 318,658.83

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Solution

The fourth proportional to 518,212.05, 775,562.40 and 318,658.83 is: 476,908.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,212.05 : 775,562.40 = 318,658.83 : x
  2. Step 2: Convert to fraction form
    518,212.05/775,562.40 = 318,658.83/x
  3. Step 3: Cross multiply
    518,212.05x = 775,562.40 × 318,658.83
  4. Step 4: Simplify right side
    518,212.05x = 247,139,806,975.99
  5. Step 5: Solve for x
    x = 247,139,806,975.99/518,212.05
  6. Step 6: Final answer
    x = 476,908.65

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1.5x scale

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.