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Finding the Fourth Proportional to 18,702,946.40, 28,007,180.40 and 12,278,415.20

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Solution

The fourth proportional to 18,702,946.40, 28,007,180.40 and 12,278,415.20 is: 18,386,610.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,702,946.40 : 28,007,180.40 = 12,278,415.20 : x
  2. Step 2: Convert to fraction form
    18,702,946.40/28,007,180.40 = 12,278,415.20/x
  3. Step 3: Cross multiply
    18,702,946.40x = 28,007,180.40 × 12,278,415.20
  4. Step 4: Simplify right side
    18,702,946.40x = 343,883,789,532,502.06
  5. Step 5: Solve for x
    x = 343,883,789,532,502.06/18,702,946.40
  6. Step 6: Final answer
    x = 18,386,610.44

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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.