Home / 20,356.11-28,075.64-13,639.59

Finding the Fourth Proportional to 20,356.11, 28,075.64 and 13,639.59

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Solution

The fourth proportional to 20,356.11, 28,075.64 and 13,639.59 is: 18,812.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,356.11 : 28,075.64 = 13,639.59 : x
  2. Step 2: Convert to fraction form
    20,356.11/28,075.64 = 13,639.59/x
  3. Step 3: Cross multiply
    20,356.11x = 28,075.64 × 13,639.59
  4. Step 4: Simplify right side
    20,356.11x = 382,940,150.39
  5. Step 5: Solve for x
    x = 382,940,150.39/20,356.11
  6. Step 6: Final answer
    x = 18,812.05

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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.