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Finding the Fourth Proportional to 15,015.40, 20,721.30 and 8,301.40

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Solution

The fourth proportional to 15,015.40, 20,721.30 and 8,301.40 is: 11,455.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,015.40 : 20,721.30 = 8,301.40 : x
  2. Step 2: Convert to fraction form
    15,015.40/20,721.30 = 8,301.40/x
  3. Step 3: Cross multiply
    15,015.40x = 20,721.30 × 8,301.40
  4. Step 4: Simplify right side
    15,015.40x = 172,015,799.82
  5. Step 5: Solve for x
    x = 172,015,799.82/15,015.40
  6. Step 6: Final answer
    x = 11,455.96

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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.