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Finding the Fourth Proportional to 399,634.05, 550,372.37 and 390,924.93

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Solution

The fourth proportional to 399,634.05, 550,372.37 and 390,924.93 is: 538,378.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,634.05 : 550,372.37 = 390,924.93 : x
  2. Step 2: Convert to fraction form
    399,634.05/550,372.37 = 390,924.93/x
  3. Step 3: Cross multiply
    399,634.05x = 550,372.37 × 390,924.93
  4. Step 4: Simplify right side
    399,634.05x = 215,154,278,261.56
  5. Step 5: Solve for x
    x = 215,154,278,261.56/399,634.05
  6. Step 6: Final answer
    x = 538,378.24

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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.