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Finding the Fourth Proportional to 486,145.40, 729,218.10 and 428,408.60

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Solution

The fourth proportional to 486,145.40, 729,218.10 and 428,408.60 is: 642,612.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,145.40 : 729,218.10 = 428,408.60 : x
  2. Step 2: Convert to fraction form
    486,145.40/729,218.10 = 428,408.60/x
  3. Step 3: Cross multiply
    486,145.40x = 729,218.10 × 428,408.60
  4. Step 4: Simplify right side
    486,145.40x = 312,403,305,315.66
  5. Step 5: Solve for x
    x = 312,403,305,315.66/486,145.40
  6. Step 6: Final answer
    x = 642,612.90

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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.