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Finding the Fourth Proportional to 680,172.58, 938,646.06 and 389,778.40

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Solution

The fourth proportional to 680,172.58, 938,646.06 and 389,778.40 is: 537,898.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,172.58 : 938,646.06 = 389,778.40 : x
  2. Step 2: Convert to fraction form
    680,172.58/938,646.06 = 389,778.40/x
  3. Step 3: Cross multiply
    680,172.58x = 938,646.06 × 389,778.40
  4. Step 4: Simplify right side
    680,172.58x = 365,863,959,433.10
  5. Step 5: Solve for x
    x = 365,863,959,433.10/680,172.58
  6. Step 6: Final answer
    x = 537,898.72

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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.