Home / 258,206.31-387,309.47-78,291.38

Finding the Fourth Proportional to 258,206.31, 387,309.47 and 78,291.38

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Solution

The fourth proportional to 258,206.31, 387,309.47 and 78,291.38 is: 117,437.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,206.31 : 387,309.47 = 78,291.38 : x
  2. Step 2: Convert to fraction form
    258,206.31/387,309.47 = 78,291.38/x
  3. Step 3: Cross multiply
    258,206.31x = 387,309.47 × 78,291.38
  4. Step 4: Simplify right side
    258,206.31x = 30,322,993,470.19
  5. Step 5: Solve for x
    x = 30,322,993,470.19/258,206.31
  6. Step 6: Final answer
    x = 117,437.07

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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.