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Finding the Fourth Proportional to 28,318.52, 39,078.71 and 15,571.71

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Solution

The fourth proportional to 28,318.52, 39,078.71 and 15,571.71 is: 21,488.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,318.52 : 39,078.71 = 15,571.71 : x
  2. Step 2: Convert to fraction form
    28,318.52/39,078.71 = 15,571.71/x
  3. Step 3: Cross multiply
    28,318.52x = 39,078.71 × 15,571.71
  4. Step 4: Simplify right side
    28,318.52x = 608,522,261.44
  5. Step 5: Solve for x
    x = 608,522,261.44/28,318.52
  6. Step 6: Final answer
    x = 21,488.49

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1.5x scale

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.