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Finding the Fourth Proportional to 821,640.80, 1,232,461.20 and 260,675.30

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Solution

The fourth proportional to 821,640.80, 1,232,461.20 and 260,675.30 is: 391,012.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,640.80 : 1,232,461.20 = 260,675.30 : x
  2. Step 2: Convert to fraction form
    821,640.80/1,232,461.20 = 260,675.30/x
  3. Step 3: Cross multiply
    821,640.80x = 1,232,461.20 × 260,675.30
  4. Step 4: Simplify right side
    821,640.80x = 321,272,193,048.36
  5. Step 5: Solve for x
    x = 321,272,193,048.36/821,640.80
  6. Step 6: Final answer
    x = 391,012.95

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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.