Home / 21,520.54-29,698.68-13,137.04

Finding the Fourth Proportional to 21,520.54, 29,698.68 and 13,137.04

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Solution

The fourth proportional to 21,520.54, 29,698.68 and 13,137.04 is: 18,129.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,520.54 : 29,698.68 = 13,137.04 : x
  2. Step 2: Convert to fraction form
    21,520.54/29,698.68 = 13,137.04/x
  3. Step 3: Cross multiply
    21,520.54x = 29,698.68 × 13,137.04
  4. Step 4: Simplify right side
    21,520.54x = 390,152,747.11
  5. Step 5: Solve for x
    x = 390,152,747.11/21,520.54
  6. Step 6: Final answer
    x = 18,129.32

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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.