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Finding the Fourth Proportional to 15,015.57, 20,721.47 and 8,391.57

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Solution

The fourth proportional to 15,015.57, 20,721.47 and 8,391.57 is: 11,580.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,015.57 : 20,721.47 = 8,391.57 : x
  2. Step 2: Convert to fraction form
    15,015.57/20,721.47 = 8,391.57/x
  3. Step 3: Cross multiply
    15,015.57x = 20,721.47 × 8,391.57
  4. Step 4: Simplify right side
    15,015.57x = 173,885,666.01
  5. Step 5: Solve for x
    x = 173,885,666.01/15,015.57
  6. Step 6: Final answer
    x = 11,580.36

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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.