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Finding the Fourth Proportional to 645,576.69, 890,860.50 and 355,182.78

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Solution

The fourth proportional to 645,576.69, 890,860.50 and 355,182.78 is: 490,132.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,576.69 : 890,860.50 = 355,182.78 : x
  2. Step 2: Convert to fraction form
    645,576.69/890,860.50 = 355,182.78/x
  3. Step 3: Cross multiply
    645,576.69x = 890,860.50 × 355,182.78
  4. Step 4: Simplify right side
    645,576.69x = 316,418,308,982.19
  5. Step 5: Solve for x
    x = 316,418,308,982.19/645,576.69
  6. Step 6: Final answer
    x = 490,132.80

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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.