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Finding the Fourth Proportional to 28,700.78, 43,059.67 and 13,719.11

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Solution

The fourth proportional to 28,700.78, 43,059.67 and 13,719.11 is: 20,582.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,700.78 : 43,059.67 = 13,719.11 : x
  2. Step 2: Convert to fraction form
    28,700.78/43,059.67 = 13,719.11/x
  3. Step 3: Cross multiply
    28,700.78x = 43,059.67 × 13,719.11
  4. Step 4: Simplify right side
    28,700.78x = 590,740,349.29
  5. Step 5: Solve for x
    x = 590,740,349.29/28,700.78
  6. Step 6: Final answer
    x = 20,582.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.