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Finding the Fourth Proportional to 389,435.20, 584,109.60 and 108,980.80

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Solution

The fourth proportional to 389,435.20, 584,109.60 and 108,980.80 is: 163,459.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,435.20 : 584,109.60 = 108,980.80 : x
  2. Step 2: Convert to fraction form
    389,435.20/584,109.60 = 108,980.80/x
  3. Step 3: Cross multiply
    389,435.20x = 584,109.60 × 108,980.80
  4. Step 4: Simplify right side
    389,435.20x = 63,656,731,495.68
  5. Step 5: Solve for x
    x = 63,656,731,495.68/389,435.20
  6. Step 6: Final answer
    x = 163,459.11

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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.