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Finding the Fourth Proportional to 12,471,938.70, 18,707,908.05 and 8,362,128.30

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Solution

The fourth proportional to 12,471,938.70, 18,707,908.05 and 8,362,128.30 is: 12,543,192.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,471,938.70 : 18,707,908.05 = 8,362,128.30 : x
  2. Step 2: Convert to fraction form
    12,471,938.70/18,707,908.05 = 8,362,128.30/x
  3. Step 3: Cross multiply
    12,471,938.70x = 18,707,908.05 × 8,362,128.30
  4. Step 4: Simplify right side
    12,471,938.70x = 156,437,927,338,702.81
  5. Step 5: Solve for x
    x = 156,437,927,338,702.81/12,471,938.70
  6. Step 6: Final answer
    x = 12,543,192.45

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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.