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Finding the Fourth Proportional to 155,781.18, 214,978.10 and 84,161.07

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Solution

The fourth proportional to 155,781.18, 214,978.10 and 84,161.07 is: 116,142.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,781.18 : 214,978.10 = 84,161.07 : x
  2. Step 2: Convert to fraction form
    155,781.18/214,978.10 = 84,161.07/x
  3. Step 3: Cross multiply
    155,781.18x = 214,978.10 × 84,161.07
  4. Step 4: Simplify right side
    155,781.18x = 18,092,786,501.76
  5. Step 5: Solve for x
    x = 18,092,786,501.76/155,781.18
  6. Step 6: Final answer
    x = 116,142.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.