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Finding the Fourth Proportional to 20,715.76, 28,602.48 and 12,760.48

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Solution

The fourth proportional to 20,715.76, 28,602.48 and 12,760.48 is: 17,618.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.76 : 28,602.48 = 12,760.48 : x
  2. Step 2: Convert to fraction form
    20,715.76/28,602.48 = 12,760.48/x
  3. Step 3: Cross multiply
    20,715.76x = 28,602.48 × 12,760.48
  4. Step 4: Simplify right side
    20,715.76x = 364,981,373.99
  5. Step 5: Solve for x
    x = 364,981,373.99/20,715.76
  6. Step 6: Final answer
    x = 17,618.54

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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.