Home / 20,872.57-28,807.10-12,917.36

Finding the Fourth Proportional to 20,872.57, 28,807.10 and 12,917.36

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Solution

The fourth proportional to 20,872.57, 28,807.10 and 12,917.36 is: 17,827.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.57 : 28,807.10 = 12,917.36 : x
  2. Step 2: Convert to fraction form
    20,872.57/28,807.10 = 12,917.36/x
  3. Step 3: Cross multiply
    20,872.57x = 28,807.10 × 12,917.36
  4. Step 4: Simplify right side
    20,872.57x = 372,111,681.26
  5. Step 5: Solve for x
    x = 372,111,681.26/20,872.57
  6. Step 6: Final answer
    x = 17,827.78

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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.