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Finding the Fourth Proportional to 28,589.88, 42,905.70 and 28,372.68

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Solution

The fourth proportional to 28,589.88, 42,905.70 and 28,372.68 is: 42,579.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,589.88 : 42,905.70 = 28,372.68 : x
  2. Step 2: Convert to fraction form
    28,589.88/42,905.70 = 28,372.68/x
  3. Step 3: Cross multiply
    28,589.88x = 42,905.70 × 28,372.68
  4. Step 4: Simplify right side
    28,589.88x = 1,217,349,696.28
  5. Step 5: Solve for x
    x = 1,217,349,696.28/28,589.88
  6. Step 6: Final answer
    x = 42,579.74

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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.