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Finding the Fourth Proportional to 15,072,020.20, 21,129,171.80 and 15,072,020.20

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Solution

The fourth proportional to 15,072,020.20, 21,129,171.80 and 15,072,020.20 is: 21,129,171.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,072,020.20 : 21,129,171.80 = 15,072,020.20 : x
  2. Step 2: Convert to fraction form
    15,072,020.20/21,129,171.80 = 15,072,020.20/x
  3. Step 3: Cross multiply
    15,072,020.20x = 21,129,171.80 × 15,072,020.20
  4. Step 4: Simplify right side
    15,072,020.20x = 318,459,304,178,870.38
  5. Step 5: Solve for x
    x = 318,459,304,178,870.38/15,072,020.20
  6. Step 6: Final answer
    x = 21,129,171.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.