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Finding the Fourth Proportional to 720,351.54, 994,034.97 and 398,055.78

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Solution

The fourth proportional to 720,351.54, 994,034.97 and 398,055.78 is: 549,289.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,351.54 : 994,034.97 = 398,055.78 : x
  2. Step 2: Convert to fraction form
    720,351.54/994,034.97 = 398,055.78/x
  3. Step 3: Cross multiply
    720,351.54x = 994,034.97 × 398,055.78
  4. Step 4: Simplify right side
    720,351.54x = 395,681,365,330.63
  5. Step 5: Solve for x
    x = 395,681,365,330.63/720,351.54
  6. Step 6: Final answer
    x = 549,289.26

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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.