Home / 15,403.53-21,256.77-8,689.20

Finding the Fourth Proportional to 15,403.53, 21,256.77 and 8,689.20

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Solution

The fourth proportional to 15,403.53, 21,256.77 and 8,689.20 is: 11,991.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,403.53 : 21,256.77 = 8,689.20 : x
  2. Step 2: Convert to fraction form
    15,403.53/21,256.77 = 8,689.20/x
  3. Step 3: Cross multiply
    15,403.53x = 21,256.77 × 8,689.20
  4. Step 4: Simplify right side
    15,403.53x = 184,704,325.88
  5. Step 5: Solve for x
    x = 184,704,325.88/15,403.53
  6. Step 6: Final answer
    x = 11,991.04

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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.