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Finding the Fourth Proportional to 28,410.76, 42,617.82 and 8,690.68

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Solution

The fourth proportional to 28,410.76, 42,617.82 and 8,690.68 is: 13,036.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,410.76 : 42,617.82 = 8,690.68 : x
  2. Step 2: Convert to fraction form
    28,410.76/42,617.82 = 8,690.68/x
  3. Step 3: Cross multiply
    28,410.76x = 42,617.82 × 8,690.68
  4. Step 4: Simplify right side
    28,410.76x = 370,377,835.92
  5. Step 5: Solve for x
    x = 370,377,835.92/28,410.76
  6. Step 6: Final answer
    x = 13,036.53

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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.