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Finding the Fourth Proportional to 819,009.80, 1,228,514.70 and 765,865.70

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Solution

The fourth proportional to 819,009.80, 1,228,514.70 and 765,865.70 is: 1,148,798.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,009.80 : 1,228,514.70 = 765,865.70 : x
  2. Step 2: Convert to fraction form
    819,009.80/1,228,514.70 = 765,865.70/x
  3. Step 3: Cross multiply
    819,009.80x = 1,228,514.70 × 765,865.70
  4. Step 4: Simplify right side
    819,009.80x = 940,877,270,675.79
  5. Step 5: Solve for x
    x = 940,877,270,675.79/819,009.80
  6. Step 6: Final answer
    x = 1,148,798.55

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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.