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Finding the Fourth Proportional to 385,912.90, 578,869.35 and 136,620.10

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Solution

The fourth proportional to 385,912.90, 578,869.35 and 136,620.10 is: 204,930.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,912.90 : 578,869.35 = 136,620.10 : x
  2. Step 2: Convert to fraction form
    385,912.90/578,869.35 = 136,620.10/x
  3. Step 3: Cross multiply
    385,912.90x = 578,869.35 × 136,620.10
  4. Step 4: Simplify right side
    385,912.90x = 79,085,188,483.94
  5. Step 5: Solve for x
    x = 79,085,188,483.94/385,912.90
  6. Step 6: Final answer
    x = 204,930.15

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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.