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Finding the Fourth Proportional to 389,993.99, 537,671.26 and 309,687.35

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Solution

The fourth proportional to 389,993.99, 537,671.26 and 309,687.35 is: 426,955.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,993.99 : 537,671.26 = 309,687.35 : x
  2. Step 2: Convert to fraction form
    389,993.99/537,671.26 = 309,687.35/x
  3. Step 3: Cross multiply
    389,993.99x = 537,671.26 × 309,687.35
  4. Step 4: Simplify right side
    389,993.99x = 166,509,987,680.56
  5. Step 5: Solve for x
    x = 166,509,987,680.56/389,993.99
  6. Step 6: Final answer
    x = 426,955.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.