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Finding the Fourth Proportional to 18,859.64, 28,269.41 and 8,978.04

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Solution

The fourth proportional to 18,859.64, 28,269.41 and 8,978.04 is: 13,457.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,859.64 : 28,269.41 = 8,978.04 : x
  2. Step 2: Convert to fraction form
    18,859.64/28,269.41 = 8,978.04/x
  3. Step 3: Cross multiply
    18,859.64x = 28,269.41 × 8,978.04
  4. Step 4: Simplify right side
    18,859.64x = 253,803,848.87
  5. Step 5: Solve for x
    x = 253,803,848.87/18,859.64
  6. Step 6: Final answer
    x = 13,457.52

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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.