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Finding the Fourth Proportional to 619,397.80, 927,930.30 and 318,855.40

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Solution

The fourth proportional to 619,397.80, 927,930.30 and 318,855.40 is: 477,682.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,397.80 : 927,930.30 = 318,855.40 : x
  2. Step 2: Convert to fraction form
    619,397.80/927,930.30 = 318,855.40/x
  3. Step 3: Cross multiply
    619,397.80x = 927,930.30 × 318,855.40
  4. Step 4: Simplify right side
    619,397.80x = 295,875,586,978.62
  5. Step 5: Solve for x
    x = 295,875,586,978.62/619,397.80
  6. Step 6: Final answer
    x = 477,682.66

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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.