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Finding the Fourth Proportional to 680,123.66, 938,578.59 and 389,729.48

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Solution

The fourth proportional to 680,123.66, 938,578.59 and 389,729.48 is: 537,831.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,123.66 : 938,578.59 = 389,729.48 : x
  2. Step 2: Convert to fraction form
    680,123.66/938,578.59 = 389,729.48/x
  3. Step 3: Cross multiply
    680,123.66x = 938,578.59 × 389,729.48
  4. Step 4: Simplify right side
    680,123.66x = 365,791,741,126.94
  5. Step 5: Solve for x
    x = 365,791,741,126.94/680,123.66
  6. Step 6: Final answer
    x = 537,831.23

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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.