Home / 258,518.56-387,778.05-81,039.40

Finding the Fourth Proportional to 258,518.56, 387,778.05 and 81,039.40

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Solution

The fourth proportional to 258,518.56, 387,778.05 and 81,039.40 is: 121,559.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,518.56 : 387,778.05 = 81,039.40 : x
  2. Step 2: Convert to fraction form
    258,518.56/387,778.05 = 81,039.40/x
  3. Step 3: Cross multiply
    258,518.56x = 387,778.05 × 81,039.40
  4. Step 4: Simplify right side
    258,518.56x = 31,425,300,505.17
  5. Step 5: Solve for x
    x = 31,425,300,505.17/258,518.56
  6. Step 6: Final answer
    x = 121,559.17

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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.