Home / 13,638.72-20,431.36-7,069.24

Finding the Fourth Proportional to 13,638.72, 20,431.36 and 7,069.24

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Solution

The fourth proportional to 13,638.72, 20,431.36 and 7,069.24 is: 10,590.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.72 : 20,431.36 = 7,069.24 : x
  2. Step 2: Convert to fraction form
    13,638.72/20,431.36 = 7,069.24/x
  3. Step 3: Cross multiply
    13,638.72x = 20,431.36 × 7,069.24
  4. Step 4: Simplify right side
    13,638.72x = 144,434,187.37
  5. Step 5: Solve for x
    x = 144,434,187.37/13,638.72
  6. Step 6: Final answer
    x = 10,590.01

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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.