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Finding the Fourth Proportional to 621,673.62, 857,450.40 and 428,142.84

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Solution

The fourth proportional to 621,673.62, 857,450.40 and 428,142.84 is: 590,520.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,673.62 : 857,450.40 = 428,142.84 : x
  2. Step 2: Convert to fraction form
    621,673.62/857,450.40 = 428,142.84/x
  3. Step 3: Cross multiply
    621,673.62x = 857,450.40 × 428,142.84
  4. Step 4: Simplify right side
    621,673.62x = 367,111,249,415.14
  5. Step 5: Solve for x
    x = 367,111,249,415.14/621,673.62
  6. Step 6: Final answer
    x = 590,520.87

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1.5x scale

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.