Home / 12,255.90-18,364.95-9,121.20

Finding the Fourth Proportional to 12,255.90, 18,364.95 and 9,121.20

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Solution

The fourth proportional to 12,255.90, 18,364.95 and 9,121.20 is: 13,667.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,255.90 : 18,364.95 = 9,121.20 : x
  2. Step 2: Convert to fraction form
    12,255.90/18,364.95 = 9,121.20/x
  3. Step 3: Cross multiply
    12,255.90x = 18,364.95 × 9,121.20
  4. Step 4: Simplify right side
    12,255.90x = 167,510,381.94
  5. Step 5: Solve for x
    x = 167,510,381.94/12,255.90
  6. Step 6: Final answer
    x = 13,667.73

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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.