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Finding the Fourth Proportional to 389,991.99, 537,668.51 and 309,685.35

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Solution

The fourth proportional to 389,991.99, 537,668.51 and 309,685.35 is: 426,952.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,991.99 : 537,668.51 = 309,685.35 : x
  2. Step 2: Convert to fraction form
    389,991.99/537,668.51 = 309,685.35/x
  3. Step 3: Cross multiply
    389,991.99x = 537,668.51 × 309,685.35
  4. Step 4: Simplify right side
    389,991.99x = 166,508,059,154.90
  5. Step 5: Solve for x
    x = 166,508,059,154.90/389,991.99
  6. Step 6: Final answer
    x = 426,952.51

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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.