Home / 20,578.32-28,398.78-12,509.28

Finding the Fourth Proportional to 20,578.32, 28,398.78 and 12,509.28

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Solution

The fourth proportional to 20,578.32, 28,398.78 and 12,509.28 is: 17,263.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,578.32 : 28,398.78 = 12,509.28 : x
  2. Step 2: Convert to fraction form
    20,578.32/28,398.78 = 12,509.28/x
  3. Step 3: Cross multiply
    20,578.32x = 28,398.78 × 12,509.28
  4. Step 4: Simplify right side
    20,578.32x = 355,248,290.68
  5. Step 5: Solve for x
    x = 355,248,290.68/20,578.32
  6. Step 6: Final answer
    x = 17,263.23

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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.