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Finding the Fourth Proportional to 18,885.65, 28,328.76 and 4,845.38

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Solution

The fourth proportional to 18,885.65, 28,328.76 and 4,845.38 is: 7,268.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,885.65 : 28,328.76 = 4,845.38 : x
  2. Step 2: Convert to fraction form
    18,885.65/28,328.76 = 4,845.38/x
  3. Step 3: Cross multiply
    18,885.65x = 28,328.76 × 4,845.38
  4. Step 4: Simplify right side
    18,885.65x = 137,263,465.49
  5. Step 5: Solve for x
    x = 137,263,465.49/18,885.65
  6. Step 6: Final answer
    x = 7,268.14

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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.