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Finding the Fourth Proportional to 18,691,805.60, 28,018,354.80 and 10,154,103.20

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Solution

The fourth proportional to 18,691,805.60, 28,018,354.80 and 10,154,103.20 is: 15,220,641.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691,805.60 : 28,018,354.80 = 10,154,103.20 : x
  2. Step 2: Convert to fraction form
    18,691,805.60/28,018,354.80 = 10,154,103.20/x
  3. Step 3: Cross multiply
    18,691,805.60x = 28,018,354.80 × 10,154,103.20
  4. Step 4: Simplify right side
    18,691,805.60x = 284,501,266,133,415.38
  5. Step 5: Solve for x
    x = 284,501,266,133,415.38/18,691,805.60
  6. Step 6: Final answer
    x = 15,220,641.18

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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.