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Finding the Fourth Proportional to 431,709.80, 647,564.70 and 423,415.40

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Solution

The fourth proportional to 431,709.80, 647,564.70 and 423,415.40 is: 635,123.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,709.80 : 647,564.70 = 423,415.40 : x
  2. Step 2: Convert to fraction form
    431,709.80/647,564.70 = 423,415.40/x
  3. Step 3: Cross multiply
    431,709.80x = 647,564.70 × 423,415.40
  4. Step 4: Simplify right side
    431,709.80x = 274,188,866,476.38
  5. Step 5: Solve for x
    x = 274,188,866,476.38/431,709.80
  6. Step 6: Final answer
    x = 635,123.10

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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.