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Finding the Fourth Proportional to 389,940.60, 584,910.90 and 109,505.40

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Solution

The fourth proportional to 389,940.60, 584,910.90 and 109,505.40 is: 164,258.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,940.60 : 584,910.90 = 109,505.40 : x
  2. Step 2: Convert to fraction form
    389,940.60/584,910.90 = 109,505.40/x
  3. Step 3: Cross multiply
    389,940.60x = 584,910.90 × 109,505.40
  4. Step 4: Simplify right side
    389,940.60x = 64,050,902,068.86
  5. Step 5: Solve for x
    x = 64,050,902,068.86/389,940.60
  6. Step 6: Final answer
    x = 164,258.10

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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.