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Finding the Fourth Proportional to 885,671.78, 1,328,498.91 and 405,763.43

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Solution

The fourth proportional to 885,671.78, 1,328,498.91 and 405,763.43 is: 608,641.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    885,671.78 : 1,328,498.91 = 405,763.43 : x
  2. Step 2: Convert to fraction form
    885,671.78/1,328,498.91 = 405,763.43/x
  3. Step 3: Cross multiply
    885,671.78x = 1,328,498.91 × 405,763.43
  4. Step 4: Simplify right side
    885,671.78x = 539,056,274,472.86
  5. Step 5: Solve for x
    x = 539,056,274,472.86/885,671.78
  6. Step 6: Final answer
    x = 608,641.13

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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.