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Finding the Fourth Proportional to 990,929.90, 1,389,168.10 and 990,929.90

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Solution

The fourth proportional to 990,929.90, 1,389,168.10 and 990,929.90 is: 1,389,168.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    990,929.90 : 1,389,168.10 = 990,929.90 : x
  2. Step 2: Convert to fraction form
    990,929.90/1,389,168.10 = 990,929.90/x
  3. Step 3: Cross multiply
    990,929.90x = 1,389,168.10 × 990,929.90
  4. Step 4: Simplify right side
    990,929.90x = 1,376,568,206,416.19
  5. Step 5: Solve for x
    x = 1,376,568,206,416.19/990,929.90
  6. Step 6: Final answer
    x = 1,389,168.10

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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.