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Finding the Fourth Proportional to 1,382,978.30, 1,908,636 and 839,252.44

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Solution

The fourth proportional to 1,382,978.30, 1,908,636 and 839,252.44 is: 1,158,244.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382,978.30 : 1,908,636 = 839,252.44 : x
  2. Step 2: Convert to fraction form
    1,382,978.30/1,908,636 = 839,252.44/x
  3. Step 3: Cross multiply
    1,382,978.30x = 1,908,636 × 839,252.44
  4. Step 4: Simplify right side
    1,382,978.30x = 1,601,827,420,071.84
  5. Step 5: Solve for x
    x = 1,601,827,420,071.84/1,382,978.30
  6. Step 6: Final answer
    x = 1,158,244.80

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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.