Home / 13,985.20-20,934.60-8,124.40

Finding the Fourth Proportional to 13,985.20, 20,934.60 and 8,124.40

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Solution

The fourth proportional to 13,985.20, 20,934.60 and 8,124.40 is: 12,161.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.20 : 20,934.60 = 8,124.40 : x
  2. Step 2: Convert to fraction form
    13,985.20/20,934.60 = 8,124.40/x
  3. Step 3: Cross multiply
    13,985.20x = 20,934.60 × 8,124.40
  4. Step 4: Simplify right side
    13,985.20x = 170,081,064.24
  5. Step 5: Solve for x
    x = 170,081,064.24/13,985.20
  6. Step 6: Final answer
    x = 12,161.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.