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Finding the Fourth Proportional to 309,117.87, 426,634.09 and 212,242.48

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Solution

The fourth proportional to 309,117.87, 426,634.09 and 212,242.48 is: 292,929.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,117.87 : 426,634.09 = 212,242.48 : x
  2. Step 2: Convert to fraction form
    309,117.87/426,634.09 = 212,242.48/x
  3. Step 3: Cross multiply
    309,117.87x = 426,634.09 × 212,242.48
  4. Step 4: Simplify right side
    309,117.87x = 90,549,875,716.95
  5. Step 5: Solve for x
    x = 90,549,875,716.95/309,117.87
  6. Step 6: Final answer
    x = 292,929.93

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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.