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Finding the Fourth Proportional to 28,459.51, 42,700.34 and 11,815.31

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Solution

The fourth proportional to 28,459.51, 42,700.34 and 11,815.31 is: 17,727.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,459.51 : 42,700.34 = 11,815.31 : x
  2. Step 2: Convert to fraction form
    28,459.51/42,700.34 = 11,815.31/x
  3. Step 3: Cross multiply
    28,459.51x = 42,700.34 × 11,815.31
  4. Step 4: Simplify right side
    28,459.51x = 504,517,890.49
  5. Step 5: Solve for x
    x = 504,517,890.49/28,459.51
  6. Step 6: Final answer
    x = 17,727.57

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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.