Home / 13,912.52-20,868.78-8,429

Finding the Fourth Proportional to 13,912.52, 20,868.78 and 8,429

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Solution

The fourth proportional to 13,912.52, 20,868.78 and 8,429 is: 12,643.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,912.52 : 20,868.78 = 8,429 : x
  2. Step 2: Convert to fraction form
    13,912.52/20,868.78 = 8,429/x
  3. Step 3: Cross multiply
    13,912.52x = 20,868.78 × 8,429
  4. Step 4: Simplify right side
    13,912.52x = 175,902,946.62
  5. Step 5: Solve for x
    x = 175,902,946.62/13,912.52
  6. Step 6: Final answer
    x = 12,643.50

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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.