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Finding the Fourth Proportional to 389,911.60, 584,575.80 and 212,618.80

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Solution

The fourth proportional to 389,911.60, 584,575.80 and 212,618.80 is: 318,769.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,911.60 : 584,575.80 = 212,618.80 : x
  2. Step 2: Convert to fraction form
    389,911.60/584,575.80 = 212,618.80/x
  3. Step 3: Cross multiply
    389,911.60x = 584,575.80 × 212,618.80
  4. Step 4: Simplify right side
    389,911.60x = 124,291,805,105.04
  5. Step 5: Solve for x
    x = 124,291,805,105.04/389,911.60
  6. Step 6: Final answer
    x = 318,769.19

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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.