Home / 20,456.47-28,223.80-12,490.32

Finding the Fourth Proportional to 20,456.47, 28,223.80 and 12,490.32

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Solution

The fourth proportional to 20,456.47, 28,223.80 and 12,490.32 is: 17,232.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.47 : 28,223.80 = 12,490.32 : x
  2. Step 2: Convert to fraction form
    20,456.47/28,223.80 = 12,490.32/x
  3. Step 3: Cross multiply
    20,456.47x = 28,223.80 × 12,490.32
  4. Step 4: Simplify right side
    20,456.47x = 352,524,293.62
  5. Step 5: Solve for x
    x = 352,524,293.62/20,456.47
  6. Step 6: Final answer
    x = 17,232.90

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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.