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Finding the Fourth Proportional to 780,687.76, 1,170,128.04 and 359,078.80

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Solution

The fourth proportional to 780,687.76, 1,170,128.04 and 359,078.80 is: 538,202.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,687.76 : 1,170,128.04 = 359,078.80 : x
  2. Step 2: Convert to fraction form
    780,687.76/1,170,128.04 = 359,078.80/x
  3. Step 3: Cross multiply
    780,687.76x = 1,170,128.04 × 359,078.80
  4. Step 4: Simplify right side
    780,687.76x = 420,168,172,449.55
  5. Step 5: Solve for x
    x = 420,168,172,449.55/780,687.76
  6. Step 6: Final answer
    x = 538,202.59

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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.