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Finding the Fourth Proportional to 28,791.93, 39,733.59 and 15,871.71

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Solution

The fourth proportional to 28,791.93, 39,733.59 and 15,871.71 is: 21,903.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,791.93 : 39,733.59 = 15,871.71 : x
  2. Step 2: Convert to fraction form
    28,791.93/39,733.59 = 15,871.71/x
  3. Step 3: Cross multiply
    28,791.93x = 39,733.59 × 15,871.71
  4. Step 4: Simplify right side
    28,791.93x = 630,640,017.74
  5. Step 5: Solve for x
    x = 630,640,017.74/28,791.93
  6. Step 6: Final answer
    x = 21,903.36

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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.