Home / 15,388.91-21,236.71-8,315.35

Finding the Fourth Proportional to 15,388.91, 21,236.71 and 8,315.35

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Solution

The fourth proportional to 15,388.91, 21,236.71 and 8,315.35 is: 11,475.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,388.91 : 21,236.71 = 8,315.35 : x
  2. Step 2: Convert to fraction form
    15,388.91/21,236.71 = 8,315.35/x
  3. Step 3: Cross multiply
    15,388.91x = 21,236.71 × 8,315.35
  4. Step 4: Simplify right side
    15,388.91x = 176,590,676.50
  5. Step 5: Solve for x
    x = 176,590,676.50/15,388.91
  6. Step 6: Final answer
    x = 11,475.19

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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.