Home / 20,587.78-28,410.72-11,513.11

Finding the Fourth Proportional to 20,587.78, 28,410.72 and 11,513.11

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Solution

The fourth proportional to 20,587.78, 28,410.72 and 11,513.11 is: 15,887.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,587.78 : 28,410.72 = 11,513.11 : x
  2. Step 2: Convert to fraction form
    20,587.78/28,410.72 = 11,513.11/x
  3. Step 3: Cross multiply
    20,587.78x = 28,410.72 × 11,513.11
  4. Step 4: Simplify right side
    20,587.78x = 327,095,744.54
  5. Step 5: Solve for x
    x = 327,095,744.54/20,587.78
  6. Step 6: Final answer
    x = 15,887.86

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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.