Home / 20,520.77-28,320.80-12,568.28

Finding the Fourth Proportional to 20,520.77, 28,320.80 and 12,568.28

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Solution

The fourth proportional to 20,520.77, 28,320.80 and 12,568.28 is: 17,345.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,520.77 : 28,320.80 = 12,568.28 : x
  2. Step 2: Convert to fraction form
    20,520.77/28,320.80 = 12,568.28/x
  3. Step 3: Cross multiply
    20,520.77x = 28,320.80 × 12,568.28
  4. Step 4: Simplify right side
    20,520.77x = 355,943,539.78
  5. Step 5: Solve for x
    x = 355,943,539.78/20,520.77
  6. Step 6: Final answer
    x = 17,345.53

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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.