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Finding the Fourth Proportional to 18,988.65, 28,489.12 and 9,128.70

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Solution

The fourth proportional to 18,988.65, 28,489.12 and 9,128.70 is: 13,696.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.65 : 28,489.12 = 9,128.70 : x
  2. Step 2: Convert to fraction form
    18,988.65/28,489.12 = 9,128.70/x
  3. Step 3: Cross multiply
    18,988.65x = 28,489.12 × 9,128.70
  4. Step 4: Simplify right side
    18,988.65x = 260,068,629.74
  5. Step 5: Solve for x
    x = 260,068,629.74/18,988.65
  6. Step 6: Final answer
    x = 13,696.00

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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.