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Finding the Fourth Proportional to 28,491.96, 39,318.96 and 15,916.68

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Solution

The fourth proportional to 28,491.96, 39,318.96 and 15,916.68 is: 21,965.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,491.96 : 39,318.96 = 15,916.68 : x
  2. Step 2: Convert to fraction form
    28,491.96/39,318.96 = 15,916.68/x
  3. Step 3: Cross multiply
    28,491.96x = 39,318.96 × 15,916.68
  4. Step 4: Simplify right side
    28,491.96x = 625,827,304.25
  5. Step 5: Solve for x
    x = 625,827,304.25/28,491.96
  6. Step 6: Final answer
    x = 21,965.05

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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.