Home / 15,403.88-21,256.47-8,689.11

Finding the Fourth Proportional to 15,403.88, 21,256.47 and 8,689.11

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Solution

The fourth proportional to 15,403.88, 21,256.47 and 8,689.11 is: 11,990.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,403.88 : 21,256.47 = 8,689.11 : x
  2. Step 2: Convert to fraction form
    15,403.88/21,256.47 = 8,689.11/x
  3. Step 3: Cross multiply
    15,403.88x = 21,256.47 × 8,689.11
  4. Step 4: Simplify right side
    15,403.88x = 184,699,806.04
  5. Step 5: Solve for x
    x = 184,699,806.04/15,403.88
  6. Step 6: Final answer
    x = 11,990.47

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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.