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Finding the Fourth Proportional to 547,891.20, 756,172.80 and 321,638.40

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Solution

The fourth proportional to 547,891.20, 756,172.80 and 321,638.40 is: 443,909.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    547,891.20 : 756,172.80 = 321,638.40 : x
  2. Step 2: Convert to fraction form
    547,891.20/756,172.80 = 321,638.40/x
  3. Step 3: Cross multiply
    547,891.20x = 756,172.80 × 321,638.40
  4. Step 4: Simplify right side
    547,891.20x = 243,214,209,515.52
  5. Step 5: Solve for x
    x = 243,214,209,515.52/547,891.20
  6. Step 6: Final answer
    x = 443,909.68

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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.