Home / 728,121.88-1,004,812.86-405,852.40

Finding the Fourth Proportional to 728,121.88, 1,004,812.86 and 405,852.40

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Solution

The fourth proportional to 728,121.88, 1,004,812.86 and 405,852.40 is: 560,078.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    728,121.88 : 1,004,812.86 = 405,852.40 : x
  2. Step 2: Convert to fraction form
    728,121.88/1,004,812.86 = 405,852.40/x
  3. Step 3: Cross multiply
    728,121.88x = 1,004,812.86 × 405,852.40
  4. Step 4: Simplify right side
    728,121.88x = 407,805,710,781.86
  5. Step 5: Solve for x
    x = 407,805,710,781.86/728,121.88
  6. Step 6: Final answer
    x = 560,078.91

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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.