Home / 13,421.32-18,521.62-8,115.20

Finding the Fourth Proportional to 13,421.32, 18,521.62 and 8,115.20

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Solution

The fourth proportional to 13,421.32, 18,521.62 and 8,115.20 is: 11,199.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.32 : 18,521.62 = 8,115.20 : x
  2. Step 2: Convert to fraction form
    13,421.32/18,521.62 = 8,115.20/x
  3. Step 3: Cross multiply
    13,421.32x = 18,521.62 × 8,115.20
  4. Step 4: Simplify right side
    13,421.32x = 150,306,650.62
  5. Step 5: Solve for x
    x = 150,306,650.62/13,421.32
  6. Step 6: Final answer
    x = 11,199.10

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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.