Home / 15,405.05-21,259.26-8,689.35

Finding the Fourth Proportional to 15,405.05, 21,259.26 and 8,689.35

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Solution

The fourth proportional to 15,405.05, 21,259.26 and 8,689.35 is: 11,991.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,405.05 : 21,259.26 = 8,689.35 : x
  2. Step 2: Convert to fraction form
    15,405.05/21,259.26 = 8,689.35/x
  3. Step 3: Cross multiply
    15,405.05x = 21,259.26 × 8,689.35
  4. Step 4: Simplify right side
    15,405.05x = 184,729,150.88
  5. Step 5: Solve for x
    x = 184,729,150.88/15,405.05
  6. Step 6: Final answer
    x = 11,991.47

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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.