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Finding the Fourth Proportional to 720,615.45, 994,431.81 and 398,317.26

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Solution

The fourth proportional to 720,615.45, 994,431.81 and 398,317.26 is: 549,668.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,615.45 : 994,431.81 = 398,317.26 : x
  2. Step 2: Convert to fraction form
    720,615.45/994,431.81 = 398,317.26/x
  3. Step 3: Cross multiply
    720,615.45x = 994,431.81 × 398,317.26
  4. Step 4: Simplify right side
    720,615.45x = 396,099,353,816.04
  5. Step 5: Solve for x
    x = 396,099,353,816.04/720,615.45
  6. Step 6: Final answer
    x = 549,668.14

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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.