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Finding the Fourth Proportional to 1,213,985.20, 1,821,706.80 and 503,939.20

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Solution

The fourth proportional to 1,213,985.20, 1,821,706.80 and 503,939.20 is: 756,211.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213,985.20 : 1,821,706.80 = 503,939.20 : x
  2. Step 2: Convert to fraction form
    1,213,985.20/1,821,706.80 = 503,939.20/x
  3. Step 3: Cross multiply
    1,213,985.20x = 1,821,706.80 × 503,939.20
  4. Step 4: Simplify right side
    1,213,985.20x = 918,029,467,426.56
  5. Step 5: Solve for x
    x = 918,029,467,426.56/1,213,985.20
  6. Step 6: Final answer
    x = 756,211.42

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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.