Home / 15,403.78-21,257.19-8,689.39

Finding the Fourth Proportional to 15,403.78, 21,257.19 and 8,689.39

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Solution

The fourth proportional to 15,403.78, 21,257.19 and 8,689.39 is: 11,991.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,403.78 : 21,257.19 = 8,689.39 : x
  2. Step 2: Convert to fraction form
    15,403.78/21,257.19 = 8,689.39/x
  3. Step 3: Cross multiply
    15,403.78x = 21,257.19 × 8,689.39
  4. Step 4: Simplify right side
    15,403.78x = 184,712,014.21
  5. Step 5: Solve for x
    x = 184,712,014.21/15,403.78
  6. Step 6: Final answer
    x = 11,991.34

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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.