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Finding the Fourth Proportional to 258,487.10, 387,742.80 and 80,999.90

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Solution

The fourth proportional to 258,487.10, 387,742.80 and 80,999.90 is: 121,503.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,487.10 : 387,742.80 = 80,999.90 : x
  2. Step 2: Convert to fraction form
    258,487.10/387,742.80 = 80,999.90/x
  3. Step 3: Cross multiply
    258,487.10x = 387,742.80 × 80,999.90
  4. Step 4: Simplify right side
    258,487.10x = 31,407,128,025.72
  5. Step 5: Solve for x
    x = 31,407,128,025.72/258,487.10
  6. Step 6: Final answer
    x = 121,503.66

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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.