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Finding the Fourth Proportional to 399,601.80, 550,327.86 and 390,892.68

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Solution

The fourth proportional to 399,601.80, 550,327.86 and 390,892.68 is: 538,333.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,601.80 : 550,327.86 = 390,892.68 : x
  2. Step 2: Convert to fraction form
    399,601.80/550,327.86 = 390,892.68/x
  3. Step 3: Cross multiply
    399,601.80x = 550,327.86 × 390,892.68
  4. Step 4: Simplify right side
    399,601.80x = 215,119,132,074.07
  5. Step 5: Solve for x
    x = 215,119,132,074.07/399,601.80
  6. Step 6: Final answer
    x = 538,333.74

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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.