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Finding the Fourth Proportional to 821,761.80, 1,232,642.70 and 260,840.20

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Solution

The fourth proportional to 821,761.80, 1,232,642.70 and 260,840.20 is: 391,260.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,761.80 : 1,232,642.70 = 260,840.20 : x
  2. Step 2: Convert to fraction form
    821,761.80/1,232,642.70 = 260,840.20/x
  3. Step 3: Cross multiply
    821,761.80x = 1,232,642.70 × 260,840.20
  4. Step 4: Simplify right side
    821,761.80x = 321,522,768,396.54
  5. Step 5: Solve for x
    x = 321,522,768,396.54/821,761.80
  6. Step 6: Final answer
    x = 391,260.30

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1.5x scale

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.