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Finding the Fourth Proportional to 619,444.35, 928,969.68 and 421,039.71

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Solution

The fourth proportional to 619,444.35, 928,969.68 and 421,039.71 is: 631,425.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,444.35 : 928,969.68 = 421,039.71 : x
  2. Step 2: Convert to fraction form
    619,444.35/928,969.68 = 421,039.71/x
  3. Step 3: Cross multiply
    619,444.35x = 928,969.68 × 421,039.71
  4. Step 4: Simplify right side
    619,444.35x = 391,133,124,665.99
  5. Step 5: Solve for x
    x = 391,133,124,665.99/619,444.35
  6. Step 6: Final answer
    x = 631,425.77

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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.