Home / 20,456.64-28,220.64-12,899.52

Finding the Fourth Proportional to 20,456.64, 28,220.64 and 12,899.52

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Solution

The fourth proportional to 20,456.64, 28,220.64 and 12,899.52 is: 17,795.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.64 : 28,220.64 = 12,899.52 : x
  2. Step 2: Convert to fraction form
    20,456.64/28,220.64 = 12,899.52/x
  3. Step 3: Cross multiply
    20,456.64x = 28,220.64 × 12,899.52
  4. Step 4: Simplify right side
    20,456.64x = 364,032,710.09
  5. Step 5: Solve for x
    x = 364,032,710.09/20,456.64
  6. Step 6: Final answer
    x = 17,795.33

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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.