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Finding the Fourth Proportional to 28,578.76, 42,869.45 and 13,800.11

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Solution

The fourth proportional to 28,578.76, 42,869.45 and 13,800.11 is: 20,700.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,578.76 : 42,869.45 = 13,800.11 : x
  2. Step 2: Convert to fraction form
    28,578.76/42,869.45 = 13,800.11/x
  3. Step 3: Cross multiply
    28,578.76x = 42,869.45 × 13,800.11
  4. Step 4: Simplify right side
    28,578.76x = 591,602,945.79
  5. Step 5: Solve for x
    x = 591,602,945.79/28,578.76
  6. Step 6: Final answer
    x = 20,700.79

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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.