Home / 20,921.31-28,871.91-11,490.08

Finding the Fourth Proportional to 20,921.31, 28,871.91 and 11,490.08

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Solution

The fourth proportional to 20,921.31, 28,871.91 and 11,490.08 is: 15,856.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.31 : 28,871.91 = 11,490.08 : x
  2. Step 2: Convert to fraction form
    20,921.31/28,871.91 = 11,490.08/x
  3. Step 3: Cross multiply
    20,921.31x = 28,871.91 × 11,490.08
  4. Step 4: Simplify right side
    20,921.31x = 331,740,411.29
  5. Step 5: Solve for x
    x = 331,740,411.29/20,921.31
  6. Step 6: Final answer
    x = 15,856.58

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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.