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Finding the Fourth Proportional to 680,289.33, 938,806.31 and 389,894.60

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Solution

The fourth proportional to 680,289.33, 938,806.31 and 389,894.60 is: 538,058.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,289.33 : 938,806.31 = 389,894.60 : x
  2. Step 2: Convert to fraction form
    680,289.33/938,806.31 = 389,894.60/x
  3. Step 3: Cross multiply
    680,289.33x = 938,806.31 × 389,894.60
  4. Step 4: Simplify right side
    680,289.33x = 366,035,513,264.77
  5. Step 5: Solve for x
    x = 366,035,513,264.77/680,289.33
  6. Step 6: Final answer
    x = 538,058.58

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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.