Home / 21,520.77-29,698.27-13,137.27

Finding the Fourth Proportional to 21,520.77, 29,698.27 and 13,137.27

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Solution

The fourth proportional to 21,520.77, 29,698.27 and 13,137.27 is: 18,129.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,520.77 : 29,698.27 = 13,137.27 : x
  2. Step 2: Convert to fraction form
    21,520.77/29,698.27 = 13,137.27/x
  3. Step 3: Cross multiply
    21,520.77x = 29,698.27 × 13,137.27
  4. Step 4: Simplify right side
    21,520.77x = 390,154,191.52
  5. Step 5: Solve for x
    x = 390,154,191.52/21,520.77
  6. Step 6: Final answer
    x = 18,129.19

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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.