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Finding the Fourth Proportional to 885,342.80, 1,328,705.40 and 412,086.80

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Solution

The fourth proportional to 885,342.80, 1,328,705.40 and 412,086.80 is: 618,451.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    885,342.80 : 1,328,705.40 = 412,086.80 : x
  2. Step 2: Convert to fraction form
    885,342.80/1,328,705.40 = 412,086.80/x
  3. Step 3: Cross multiply
    885,342.80x = 1,328,705.40 × 412,086.80
  4. Step 4: Simplify right side
    885,342.80x = 547,541,956,428.72
  5. Step 5: Solve for x
    x = 547,541,956,428.72/885,342.80
  6. Step 6: Final answer
    x = 618,451.92

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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.