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Finding the Fourth Proportional to 390,847.67, 539,324.39 and 218,775.22

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Solution

The fourth proportional to 390,847.67, 539,324.39 and 218,775.22 is: 301,884.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,847.67 : 539,324.39 = 218,775.22 : x
  2. Step 2: Convert to fraction form
    390,847.67/539,324.39 = 218,775.22/x
  3. Step 3: Cross multiply
    390,847.67x = 539,324.39 × 218,775.22
  4. Step 4: Simplify right side
    390,847.67x = 117,990,812,073.62
  5. Step 5: Solve for x
    x = 117,990,812,073.62/390,847.67
  6. Step 6: Final answer
    x = 301,884.39

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1.5x scale

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.