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Finding the Fourth Proportional to 1,287,938.80, 1,931,821.80 and 341,289.20

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Solution

The fourth proportional to 1,287,938.80, 1,931,821.80 and 341,289.20 is: 511,910.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,938.80 : 1,931,821.80 = 341,289.20 : x
  2. Step 2: Convert to fraction form
    1,287,938.80/1,931,821.80 = 341,289.20/x
  3. Step 3: Cross multiply
    1,287,938.80x = 1,931,821.80 × 341,289.20
  4. Step 4: Simplify right side
    1,287,938.80x = 659,309,916,664.56
  5. Step 5: Solve for x
    x = 659,309,916,664.56/1,287,938.80
  6. Step 6: Final answer
    x = 511,910.90

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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.