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Finding the Fourth Proportional to 447,071.76, 618,583.65 and 389,830.44

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Solution

The fourth proportional to 447,071.76, 618,583.65 and 389,830.44 is: 539,382.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    447,071.76 : 618,583.65 = 389,830.44 : x
  2. Step 2: Convert to fraction form
    447,071.76/618,583.65 = 389,830.44/x
  3. Step 3: Cross multiply
    447,071.76x = 618,583.65 × 389,830.44
  4. Step 4: Simplify right side
    447,071.76x = 241,142,740,237.86
  5. Step 5: Solve for x
    x = 241,142,740,237.86/447,071.76
  6. Step 6: Final answer
    x = 539,382.63

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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.