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Finding the Fourth Proportional to 1,001,869.12, 1,382,788.32 and 921,169.12

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Solution

The fourth proportional to 1,001,869.12, 1,382,788.32 and 921,169.12 is: 1,271,405.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001,869.12 : 1,382,788.32 = 921,169.12 : x
  2. Step 2: Convert to fraction form
    1,001,869.12/1,382,788.32 = 921,169.12/x
  3. Step 3: Cross multiply
    1,001,869.12x = 1,382,788.32 × 921,169.12
  4. Step 4: Simplify right side
    1,001,869.12x = 1,273,781,899,880.68
  5. Step 5: Solve for x
    x = 1,273,781,899,880.68/1,001,869.12
  6. Step 6: Final answer
    x = 1,271,405.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.