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Finding the Fourth Proportional to 1,290,939.40, 1,936,409.10 and 992,924.20

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Solution

The fourth proportional to 1,290,939.40, 1,936,409.10 and 992,924.20 is: 1,489,386.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,939.40 : 1,936,409.10 = 992,924.20 : x
  2. Step 2: Convert to fraction form
    1,290,939.40/1,936,409.10 = 992,924.20/x
  3. Step 3: Cross multiply
    1,290,939.40x = 1,936,409.10 × 992,924.20
  4. Step 4: Simplify right side
    1,290,939.40x = 1,922,707,456,490.22
  5. Step 5: Solve for x
    x = 1,922,707,456,490.22/1,290,939.40
  6. Step 6: Final answer
    x = 1,489,386.30

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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.