Home / 21,820.58-30,115.21-13,320.92

Finding the Fourth Proportional to 21,820.58, 30,115.21 and 13,320.92

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Solution

The fourth proportional to 21,820.58, 30,115.21 and 13,320.92 is: 18,384.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,820.58 : 30,115.21 = 13,320.92 : x
  2. Step 2: Convert to fraction form
    21,820.58/30,115.21 = 13,320.92/x
  3. Step 3: Cross multiply
    21,820.58x = 30,115.21 × 13,320.92
  4. Step 4: Simplify right side
    21,820.58x = 401,162,303.19
  5. Step 5: Solve for x
    x = 401,162,303.19/21,820.58
  6. Step 6: Final answer
    x = 18,384.58

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Double scale
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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.