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Finding the Fourth Proportional to 261,274.89, 391,978.14 and 74,286.39

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Solution

The fourth proportional to 261,274.89, 391,978.14 and 74,286.39 is: 111,448.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,274.89 : 391,978.14 = 74,286.39 : x
  2. Step 2: Convert to fraction form
    261,274.89/391,978.14 = 74,286.39/x
  3. Step 3: Cross multiply
    261,274.89x = 391,978.14 × 74,286.39
  4. Step 4: Simplify right side
    261,274.89x = 29,118,640,979.51
  5. Step 5: Solve for x
    x = 29,118,640,979.51/261,274.89
  6. Step 6: Final answer
    x = 111,448.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.