Home / 20,490.90-28,272.40-12,530.22

Finding the Fourth Proportional to 20,490.90, 28,272.40 and 12,530.22

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Solution

The fourth proportional to 20,490.90, 28,272.40 and 12,530.22 is: 17,288.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.90 : 28,272.40 = 12,530.22 : x
  2. Step 2: Convert to fraction form
    20,490.90/28,272.40 = 12,530.22/x
  3. Step 3: Cross multiply
    20,490.90x = 28,272.40 × 12,530.22
  4. Step 4: Simplify right side
    20,490.90x = 354,259,391.93
  5. Step 5: Solve for x
    x = 354,259,391.93/20,490.90
  6. Step 6: Final answer
    x = 17,288.62

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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.