Home / 28,356.06-39,131.47-15,780.81

Finding the Fourth Proportional to 28,356.06, 39,131.47 and 15,780.81

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Solution

The fourth proportional to 28,356.06, 39,131.47 and 15,780.81 is: 21,777.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,356.06 : 39,131.47 = 15,780.81 : x
  2. Step 2: Convert to fraction form
    28,356.06/39,131.47 = 15,780.81/x
  3. Step 3: Cross multiply
    28,356.06x = 39,131.47 × 15,780.81
  4. Step 4: Simplify right side
    28,356.06x = 617,526,293.09
  5. Step 5: Solve for x
    x = 617,526,293.09/28,356.06
  6. Step 6: Final answer
    x = 21,777.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.