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Finding the Fourth Proportional to 68,680,082.60, 103,020,123.90 and 20,804,805.80

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Solution

The fourth proportional to 68,680,082.60, 103,020,123.90 and 20,804,805.80 is: 31,207,208.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,680,082.60 : 103,020,123.90 = 20,804,805.80 : x
  2. Step 2: Convert to fraction form
    68,680,082.60/103,020,123.90 = 20,804,805.80/x
  3. Step 3: Cross multiply
    68,680,082.60x = 103,020,123.90 × 20,804,805.80
  4. Step 4: Simplify right side
    68,680,082.60x = 2,143,313,671,231,438.75
  5. Step 5: Solve for x
    x = 2,143,313,671,231,438.75/68,680,082.60
  6. Step 6: Final answer
    x = 31,207,208.70

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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.