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Finding the Fourth Proportional to 821,640.30, 1,232,460.45 and 260,674.80

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Solution

The fourth proportional to 821,640.30, 1,232,460.45 and 260,674.80 is: 391,012.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,640.30 : 1,232,460.45 = 260,674.80 : x
  2. Step 2: Convert to fraction form
    821,640.30/1,232,460.45 = 260,674.80/x
  3. Step 3: Cross multiply
    821,640.30x = 1,232,460.45 × 260,674.80
  4. Step 4: Simplify right side
    821,640.30x = 321,271,381,311.66
  5. Step 5: Solve for x
    x = 321,271,381,311.66/821,640.30
  6. Step 6: Final answer
    x = 391,012.20

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Similar ratio
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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.