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Finding the Fourth Proportional to 15,003.78, 20,706.48 and 8,715.76

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Solution

The fourth proportional to 15,003.78, 20,706.48 and 8,715.76 is: 12,028.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,003.78 : 20,706.48 = 8,715.76 : x
  2. Step 2: Convert to fraction form
    15,003.78/20,706.48 = 8,715.76/x
  3. Step 3: Cross multiply
    15,003.78x = 20,706.48 × 8,715.76
  4. Step 4: Simplify right side
    15,003.78x = 180,472,710.12
  5. Step 5: Solve for x
    x = 180,472,710.12/15,003.78
  6. Step 6: Final answer
    x = 12,028.48

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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.