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Finding the Fourth Proportional to 15,322.87, 21,149.93 and 8,951

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Solution

The fourth proportional to 15,322.87, 21,149.93 and 8,951 is: 12,354.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,322.87 : 21,149.93 = 8,951 : x
  2. Step 2: Convert to fraction form
    15,322.87/21,149.93 = 8,951/x
  3. Step 3: Cross multiply
    15,322.87x = 21,149.93 × 8,951
  4. Step 4: Simplify right side
    15,322.87x = 189,312,978.68
  5. Step 5: Solve for x
    x = 189,312,978.68/15,322.87
  6. Step 6: Final answer
    x = 12,354.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.