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Finding the Fourth Proportional to 1,211,721,000.55, 1,817,581,500.83 and 1,211,721,000.55

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Solution

The fourth proportional to 1,211,721,000.55, 1,817,581,500.83 and 1,211,721,000.55 is: 1,817,581,500.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211,721,000.55 : 1,817,581,500.83 = 1,211,721,000.55 : x
  2. Step 2: Convert to fraction form
    1,211,721,000.55/1,817,581,500.83 = 1,211,721,000.55/x
  3. Step 3: Cross multiply
    1,211,721,000.55x = 1,817,581,500.83 × 1,211,721,000.55
  4. Step 4: Simplify right side
    1,211,721,000.55x = 2,202,401,674,760,839,680
  5. Step 5: Solve for x
    x = 2,202,401,674,760,839,680/1,211,721,000.55
  6. Step 6: Final answer
    x = 1,817,581,500.83

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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.