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Finding the Fourth Proportional to 328,078.62, 491,281.20 and 261,615.69

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Solution

The fourth proportional to 328,078.62, 491,281.20 and 261,615.69 is: 391,756.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,078.62 : 491,281.20 = 261,615.69 : x
  2. Step 2: Convert to fraction form
    328,078.62/491,281.20 = 261,615.69/x
  3. Step 3: Cross multiply
    328,078.62x = 491,281.20 × 261,615.69
  4. Step 4: Simplify right side
    328,078.62x = 128,526,870,122.03
  5. Step 5: Solve for x
    x = 128,526,870,122.03/328,078.62
  6. Step 6: Final answer
    x = 391,756.31

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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.