Home / 20,916.72-28,865-11,485.04

Finding the Fourth Proportional to 20,916.72, 28,865 and 11,485.04

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Solution

The fourth proportional to 20,916.72, 28,865 and 11,485.04 is: 15,849.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916.72 : 28,865 = 11,485.04 : x
  2. Step 2: Convert to fraction form
    20,916.72/28,865 = 11,485.04/x
  3. Step 3: Cross multiply
    20,916.72x = 28,865 × 11,485.04
  4. Step 4: Simplify right side
    20,916.72x = 331,515,679.60
  5. Step 5: Solve for x
    x = 331,515,679.60/20,916.72
  6. Step 6: Final answer
    x = 15,849.31

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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.