Home / 28,356.56-39,111.72-20,805.20

Finding the Fourth Proportional to 28,356.56, 39,111.72 and 20,805.20

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Solution

The fourth proportional to 28,356.56, 39,111.72 and 20,805.20 is: 28,696.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,356.56 : 39,111.72 = 20,805.20 : x
  2. Step 2: Convert to fraction form
    28,356.56/39,111.72 = 20,805.20/x
  3. Step 3: Cross multiply
    28,356.56x = 39,111.72 × 20,805.20
  4. Step 4: Simplify right side
    28,356.56x = 813,727,156.94
  5. Step 5: Solve for x
    x = 813,727,156.94/28,356.56
  6. Step 6: Final answer
    x = 28,696.26

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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.