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Finding the Fourth Proportional to 18,989.60, 28,476.18 and 7,888.68

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Solution

The fourth proportional to 18,989.60, 28,476.18 and 7,888.68 is: 11,829.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.60 : 28,476.18 = 7,888.68 : x
  2. Step 2: Convert to fraction form
    18,989.60/28,476.18 = 7,888.68/x
  3. Step 3: Cross multiply
    18,989.60x = 28,476.18 × 7,888.68
  4. Step 4: Simplify right side
    18,989.60x = 224,639,477.66
  5. Step 5: Solve for x
    x = 224,639,477.66/18,989.60
  6. Step 6: Final answer
    x = 11,829.61

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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.