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Finding the Fourth Proportional to 521,389.80, 780,918.30 and 428,077.80

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Solution

The fourth proportional to 521,389.80, 780,918.30 and 428,077.80 is: 641,159.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,389.80 : 780,918.30 = 428,077.80 : x
  2. Step 2: Convert to fraction form
    521,389.80/780,918.30 = 428,077.80/x
  3. Step 3: Cross multiply
    521,389.80x = 780,918.30 × 428,077.80
  4. Step 4: Simplify right side
    521,389.80x = 334,293,787,843.74
  5. Step 5: Solve for x
    x = 334,293,787,843.74/521,389.80
  6. Step 6: Final answer
    x = 641,159.05

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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.