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Finding the Fourth Proportional to 18,912,643.20, 28,368,964.80 and 11,259,892.80

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Solution

The fourth proportional to 18,912,643.20, 28,368,964.80 and 11,259,892.80 is: 16,889,839.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912,643.20 : 28,368,964.80 = 11,259,892.80 : x
  2. Step 2: Convert to fraction form
    18,912,643.20/28,368,964.80 = 11,259,892.80/x
  3. Step 3: Cross multiply
    18,912,643.20x = 28,368,964.80 × 11,259,892.80
  4. Step 4: Simplify right side
    18,912,643.20x = 319,431,502,494,973.50
  5. Step 5: Solve for x
    x = 319,431,502,494,973.50/18,912,643.20
  6. Step 6: Final answer
    x = 16,889,839.20

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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.