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Finding the Fourth Proportional to 861,578.75, 1,292,374.54 and 321,957

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Solution

The fourth proportional to 861,578.75, 1,292,374.54 and 321,957 is: 482,937.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,578.75 : 1,292,374.54 = 321,957 : x
  2. Step 2: Convert to fraction form
    861,578.75/1,292,374.54 = 321,957/x
  3. Step 3: Cross multiply
    861,578.75x = 1,292,374.54 × 321,957
  4. Step 4: Simplify right side
    861,578.75x = 416,089,028,969.89
  5. Step 5: Solve for x
    x = 416,089,028,969.89/861,578.75
  6. Step 6: Final answer
    x = 482,937.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.