Home / 20,920.20-28,878.10-12,535.08

Finding the Fourth Proportional to 20,920.20, 28,878.10 and 12,535.08

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Solution

The fourth proportional to 20,920.20, 28,878.10 and 12,535.08 is: 17,303.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.20 : 28,878.10 = 12,535.08 : x
  2. Step 2: Convert to fraction form
    20,920.20/28,878.10 = 12,535.08/x
  3. Step 3: Cross multiply
    20,920.20x = 28,878.10 × 12,535.08
  4. Step 4: Simplify right side
    20,920.20x = 361,989,293.75
  5. Step 5: Solve for x
    x = 361,989,293.75/20,920.20
  6. Step 6: Final answer
    x = 17,303.34

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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.