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Finding the Fourth Proportional to 258,539.80, 387,809.70 and 68,999.80

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Solution

The fourth proportional to 258,539.80, 387,809.70 and 68,999.80 is: 103,499.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,539.80 : 387,809.70 = 68,999.80 : x
  2. Step 2: Convert to fraction form
    258,539.80/387,809.70 = 68,999.80/x
  3. Step 3: Cross multiply
    258,539.80x = 387,809.70 × 68,999.80
  4. Step 4: Simplify right side
    258,539.80x = 26,758,791,738.06
  5. Step 5: Solve for x
    x = 26,758,791,738.06/258,539.80
  6. Step 6: Final answer
    x = 103,499.70

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Similar ratio
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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.