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Finding the Fourth Proportional to 619,443.85, 928,968.94 and 421,039.21

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Solution

The fourth proportional to 619,443.85, 928,968.94 and 421,039.21 is: 631,425.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,443.85 : 928,968.94 = 421,039.21 : x
  2. Step 2: Convert to fraction form
    619,443.85/928,968.94 = 421,039.21/x
  3. Step 3: Cross multiply
    619,443.85x = 928,968.94 × 421,039.21
  4. Step 4: Simplify right side
    619,443.85x = 391,132,348,612.14
  5. Step 5: Solve for x
    x = 391,132,348,612.14/619,443.85
  6. Step 6: Final answer
    x = 631,425.03

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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.