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Finding the Fourth Proportional to 642,131.80, 963,485.70 and 221,709.40

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Solution

The fourth proportional to 642,131.80, 963,485.70 and 221,709.40 is: 332,663.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,131.80 : 963,485.70 = 221,709.40 : x
  2. Step 2: Convert to fraction form
    642,131.80/963,485.70 = 221,709.40/x
  3. Step 3: Cross multiply
    642,131.80x = 963,485.70 × 221,709.40
  4. Step 4: Simplify right side
    642,131.80x = 213,613,836,455.58
  5. Step 5: Solve for x
    x = 213,613,836,455.58/642,131.80
  6. Step 6: Final answer
    x = 332,663.54

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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.