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Finding the Fourth Proportional to 1,368,721.80, 1,888,766.10 and 765,109.80

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Solution

The fourth proportional to 1,368,721.80, 1,888,766.10 and 765,109.80 is: 1,055,812.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368,721.80 : 1,888,766.10 = 765,109.80 : x
  2. Step 2: Convert to fraction form
    1,368,721.80/1,888,766.10 = 765,109.80/x
  3. Step 3: Cross multiply
    1,368,721.80x = 1,888,766.10 × 765,109.80
  4. Step 4: Simplify right side
    1,368,721.80x = 1,445,113,453,017.78
  5. Step 5: Solve for x
    x = 1,445,113,453,017.78/1,368,721.80
  6. Step 6: Final answer
    x = 1,055,812.40

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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.