Home / 15,388.71-21,236.42-8,315.15

Finding the Fourth Proportional to 15,388.71, 21,236.42 and 8,315.15

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Solution

The fourth proportional to 15,388.71, 21,236.42 and 8,315.15 is: 11,474.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,388.71 : 21,236.42 = 8,315.15 : x
  2. Step 2: Convert to fraction form
    15,388.71/21,236.42 = 8,315.15/x
  3. Step 3: Cross multiply
    15,388.71x = 21,236.42 × 8,315.15
  4. Step 4: Simplify right side
    15,388.71x = 176,583,870.01
  5. Step 5: Solve for x
    x = 176,583,870.01/15,388.71
  6. Step 6: Final answer
    x = 11,474.90

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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.