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Finding the Fourth Proportional to 662,521.43, 991,820.31 and 408,986.70

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Solution

The fourth proportional to 662,521.43, 991,820.31 and 408,986.70 is: 612,268.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    662,521.43 : 991,820.31 = 408,986.70 : x
  2. Step 2: Convert to fraction form
    662,521.43/991,820.31 = 408,986.70/x
  3. Step 3: Cross multiply
    662,521.43x = 991,820.31 × 408,986.70
  4. Step 4: Simplify right side
    662,521.43x = 405,641,315,579.88
  5. Step 5: Solve for x
    x = 405,641,315,579.88/662,521.43
  6. Step 6: Final answer
    x = 612,268.98

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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.