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Finding the Fourth Proportional to 620,545.95, 929,978.08 and 321,236.66

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Solution

The fourth proportional to 620,545.95, 929,978.08 and 321,236.66 is: 481,419.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,545.95 : 929,978.08 = 321,236.66 : x
  2. Step 2: Convert to fraction form
    620,545.95/929,978.08 = 321,236.66/x
  3. Step 3: Cross multiply
    620,545.95x = 929,978.08 × 321,236.66
  4. Step 4: Simplify right side
    620,545.95x = 298,743,053,814.27
  5. Step 5: Solve for x
    x = 298,743,053,814.27/620,545.95
  6. Step 6: Final answer
    x = 481,419.71

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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.