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Finding the Fourth Proportional to 642,335.80, 963,276.90 and 221,513.80

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Solution

The fourth proportional to 642,335.80, 963,276.90 and 221,513.80 is: 332,192.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,335.80 : 963,276.90 = 221,513.80 : x
  2. Step 2: Convert to fraction form
    642,335.80/963,276.90 = 221,513.80/x
  3. Step 3: Cross multiply
    642,335.80x = 963,276.90 × 221,513.80
  4. Step 4: Simplify right side
    642,335.80x = 213,379,126,571.22
  5. Step 5: Solve for x
    x = 213,379,126,571.22/642,335.80
  6. Step 6: Final answer
    x = 332,192.49

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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.