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Finding the Fourth Proportional to 619,445.61, 928,971.54 and 421,040.97

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Solution

The fourth proportional to 619,445.61, 928,971.54 and 421,040.97 is: 631,427.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,445.61 : 928,971.54 = 421,040.97 : x
  2. Step 2: Convert to fraction form
    619,445.61/928,971.54 = 421,040.97/x
  3. Step 3: Cross multiply
    619,445.61x = 928,971.54 × 421,040.97
  4. Step 4: Simplify right side
    619,445.61x = 391,135,078,303.99
  5. Step 5: Solve for x
    x = 391,135,078,303.99/619,445.61
  6. Step 6: Final answer
    x = 631,427.64

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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.