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Finding the Fourth Proportional to 389,992.99, 537,669.89 and 309,686.35

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Solution

The fourth proportional to 389,992.99, 537,669.89 and 309,686.35 is: 426,953.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,992.99 : 537,669.89 = 309,686.35 : x
  2. Step 2: Convert to fraction form
    389,992.99/537,669.89 = 309,686.35/x
  3. Step 3: Cross multiply
    389,992.99x = 537,669.89 × 309,686.35
  4. Step 4: Simplify right side
    389,992.99x = 166,509,024,190.57
  5. Step 5: Solve for x
    x = 166,509,024,190.57/389,992.99
  6. Step 6: Final answer
    x = 426,953.89

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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.