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Finding the Fourth Proportional to 421,628.26, 581,860.79 and 240,336.90

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Solution

The fourth proportional to 421,628.26, 581,860.79 and 240,336.90 is: 331,672.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,628.26 : 581,860.79 = 240,336.90 : x
  2. Step 2: Convert to fraction form
    421,628.26/581,860.79 = 240,336.90/x
  3. Step 3: Cross multiply
    421,628.26x = 581,860.79 × 240,336.90
  4. Step 4: Simplify right side
    421,628.26x = 139,842,618,500.15
  5. Step 5: Solve for x
    x = 139,842,618,500.15/421,628.26
  6. Step 6: Final answer
    x = 331,672.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.