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Finding the Fourth Proportional to 28,358.48, 42,536 and 12,558.90

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Solution

The fourth proportional to 28,358.48, 42,536 and 12,558.90 is: 18,837.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,358.48 : 42,536 = 12,558.90 : x
  2. Step 2: Convert to fraction form
    28,358.48/42,536 = 12,558.90/x
  3. Step 3: Cross multiply
    28,358.48x = 42,536 × 12,558.90
  4. Step 4: Simplify right side
    28,358.48x = 534,205,370.40
  5. Step 5: Solve for x
    x = 534,205,370.40/28,358.48
  6. Step 6: Final answer
    x = 18,837.59

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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.