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Finding the Fourth Proportional to 642,245.80, 963,141.90 and 221,423.80

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Solution

The fourth proportional to 642,245.80, 963,141.90 and 221,423.80 is: 332,057.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,245.80 : 963,141.90 = 221,423.80 : x
  2. Step 2: Convert to fraction form
    642,245.80/963,141.90 = 221,423.80/x
  3. Step 3: Cross multiply
    642,245.80x = 963,141.90 × 221,423.80
  4. Step 4: Simplify right side
    642,245.80x = 213,262,539,437.22
  5. Step 5: Solve for x
    x = 213,262,539,437.22/642,245.80
  6. Step 6: Final answer
    x = 332,057.51

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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.