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Finding the Fourth Proportional to 642,135.80, 963,491.70 and 221,713.40

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Solution

The fourth proportional to 642,135.80, 963,491.70 and 221,713.40 is: 332,669.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,135.80 : 963,491.70 = 221,713.40 : x
  2. Step 2: Convert to fraction form
    642,135.80/963,491.70 = 221,713.40/x
  3. Step 3: Cross multiply
    642,135.80x = 963,491.70 × 221,713.40
  4. Step 4: Simplify right side
    642,135.80x = 213,619,020,678.78
  5. Step 5: Solve for x
    x = 213,619,020,678.78/642,135.80
  6. Step 6: Final answer
    x = 332,669.54

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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.