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Finding the Fourth Proportional to 389,990.99, 537,667.12 and 309,684.35

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Solution

The fourth proportional to 389,990.99, 537,667.12 and 309,684.35 is: 426,951.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,990.99 : 537,667.12 = 309,684.35 : x
  2. Step 2: Convert to fraction form
    389,990.99/537,667.12 = 309,684.35/x
  3. Step 3: Cross multiply
    389,990.99x = 537,667.12 × 309,684.35
  4. Step 4: Simplify right side
    389,990.99x = 166,507,092,573.57
  5. Step 5: Solve for x
    x = 166,507,092,573.57/389,990.99
  6. Step 6: Final answer
    x = 426,951.13

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1.5x scale

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.