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Finding the Fourth Proportional to 386,620.12, 533,290.26 and 279,347.68

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Solution

The fourth proportional to 386,620.12, 533,290.26 and 279,347.68 is: 385,322.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,620.12 : 533,290.26 = 279,347.68 : x
  2. Step 2: Convert to fraction form
    386,620.12/533,290.26 = 279,347.68/x
  3. Step 3: Cross multiply
    386,620.12x = 533,290.26 × 279,347.68
  4. Step 4: Simplify right side
    386,620.12x = 148,973,396,897.60
  5. Step 5: Solve for x
    x = 148,973,396,897.60/386,620.12
  6. Step 6: Final answer
    x = 385,322.41

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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.