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Finding the Fourth Proportional to 1,383,512, 1,909,275.72 and 779,900

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Solution

The fourth proportional to 1,383,512, 1,909,275.72 and 779,900 is: 1,076,278.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383,512 : 1,909,275.72 = 779,900 : x
  2. Step 2: Convert to fraction form
    1,383,512/1,909,275.72 = 779,900/x
  3. Step 3: Cross multiply
    1,383,512x = 1,909,275.72 × 779,900
  4. Step 4: Simplify right side
    1,383,512x = 1,489,044,134,028
  5. Step 5: Solve for x
    x = 1,489,044,134,028/1,383,512
  6. Step 6: Final answer
    x = 1,076,278.44

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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.