Home / 20,418.86-28,180.64-12,459.40

Finding the Fourth Proportional to 20,418.86, 28,180.64 and 12,459.40

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Solution

The fourth proportional to 20,418.86, 28,180.64 and 12,459.40 is: 17,195.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,418.86 : 28,180.64 = 12,459.40 : x
  2. Step 2: Convert to fraction form
    20,418.86/28,180.64 = 12,459.40/x
  3. Step 3: Cross multiply
    20,418.86x = 28,180.64 × 12,459.40
  4. Step 4: Simplify right side
    20,418.86x = 351,113,866.02
  5. Step 5: Solve for x
    x = 351,113,866.02/20,418.86
  6. Step 6: Final answer
    x = 17,195.57

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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.