Home / 679,969.40-1,020,107.70-399,342.20

Finding the Fourth Proportional to 679,969.40, 1,020,107.70 and 399,342.20

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Solution

The fourth proportional to 679,969.40, 1,020,107.70 and 399,342.20 is: 599,103.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,969.40 : 1,020,107.70 = 399,342.20 : x
  2. Step 2: Convert to fraction form
    679,969.40/1,020,107.70 = 399,342.20/x
  3. Step 3: Cross multiply
    679,969.40x = 1,020,107.70 × 399,342.20
  4. Step 4: Simplify right side
    679,969.40x = 407,372,053,154.94
  5. Step 5: Solve for x
    x = 407,372,053,154.94/679,969.40
  6. Step 6: Final answer
    x = 599,103.51

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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.