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Finding the Fourth Proportional to 911,841.80, 1,367,762.70 and 821,640.20

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Solution

The fourth proportional to 911,841.80, 1,367,762.70 and 821,640.20 is: 1,232,460.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    911,841.80 : 1,367,762.70 = 821,640.20 : x
  2. Step 2: Convert to fraction form
    911,841.80/1,367,762.70 = 821,640.20/x
  3. Step 3: Cross multiply
    911,841.80x = 1,367,762.70 × 821,640.20
  4. Step 4: Simplify right side
    911,841.80x = 1,123,808,818,380.54
  5. Step 5: Solve for x
    x = 1,123,808,818,380.54/911,841.80
  6. Step 6: Final answer
    x = 1,232,460.30

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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.