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Finding the Fourth Proportional to 19,321.32, 28,978.53 and 8,788.87

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Solution

The fourth proportional to 19,321.32, 28,978.53 and 8,788.87 is: 13,181.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,321.32 : 28,978.53 = 8,788.87 : x
  2. Step 2: Convert to fraction form
    19,321.32/28,978.53 = 8,788.87/x
  3. Step 3: Cross multiply
    19,321.32x = 28,978.53 × 8,788.87
  4. Step 4: Simplify right side
    19,321.32x = 254,688,532.96
  5. Step 5: Solve for x
    x = 254,688,532.96/19,321.32
  6. Step 6: Final answer
    x = 13,181.74

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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.