Home / 21,135.89-29,187.28-13,595.31

Finding the Fourth Proportional to 21,135.89, 29,187.28 and 13,595.31

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Solution

The fourth proportional to 21,135.89, 29,187.28 and 13,595.31 is: 18,774.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,135.89 : 29,187.28 = 13,595.31 : x
  2. Step 2: Convert to fraction form
    21,135.89/29,187.28 = 13,595.31/x
  3. Step 3: Cross multiply
    21,135.89x = 29,187.28 × 13,595.31
  4. Step 4: Simplify right side
    21,135.89x = 396,810,096.31
  5. Step 5: Solve for x
    x = 396,810,096.31/21,135.89
  6. Step 6: Final answer
    x = 18,774.23

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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.