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Finding the Fourth Proportional to 258,478.48, 387,717.86 and 80,999.38

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Solution

The fourth proportional to 258,478.48, 387,717.86 and 80,999.38 is: 121,499.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,478.48 : 387,717.86 = 80,999.38 : x
  2. Step 2: Convert to fraction form
    258,478.48/387,717.86 = 80,999.38/x
  3. Step 3: Cross multiply
    258,478.48x = 387,717.86 × 80,999.38
  4. Step 4: Simplify right side
    258,478.48x = 31,404,906,962.07
  5. Step 5: Solve for x
    x = 31,404,906,962.07/258,478.48
  6. Step 6: Final answer
    x = 121,499.12

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1.5x scale

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.