Home / 13,420.31-18,521.73-8,115.16

Finding the Fourth Proportional to 13,420.31, 18,521.73 and 8,115.16

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Solution

The fourth proportional to 13,420.31, 18,521.73 and 8,115.16 is: 11,199.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.31 : 18,521.73 = 8,115.16 : x
  2. Step 2: Convert to fraction form
    13,420.31/18,521.73 = 8,115.16/x
  3. Step 3: Cross multiply
    13,420.31x = 18,521.73 × 8,115.16
  4. Step 4: Simplify right side
    13,420.31x = 150,306,802.43
  5. Step 5: Solve for x
    x = 150,306,802.43/13,420.31
  6. Step 6: Final answer
    x = 11,199.95

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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.