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Finding the Fourth Proportional to 1,245,608.10, 1,868,412.15 and 1,021,221.90

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Solution

The fourth proportional to 1,245,608.10, 1,868,412.15 and 1,021,221.90 is: 1,531,832.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245,608.10 : 1,868,412.15 = 1,021,221.90 : x
  2. Step 2: Convert to fraction form
    1,245,608.10/1,868,412.15 = 1,021,221.90/x
  3. Step 3: Cross multiply
    1,245,608.10x = 1,868,412.15 × 1,021,221.90
  4. Step 4: Simplify right side
    1,245,608.10x = 1,908,063,405,806.09
  5. Step 5: Solve for x
    x = 1,908,063,405,806.09/1,245,608.10
  6. Step 6: Final answer
    x = 1,531,832.85

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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.