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Finding the Fourth Proportional to 25,920.48, 38,881.92 and 8,391.68

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Solution

The fourth proportional to 25,920.48, 38,881.92 and 8,391.68 is: 12,587.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,920.48 : 38,881.92 = 8,391.68 : x
  2. Step 2: Convert to fraction form
    25,920.48/38,881.92 = 8,391.68/x
  3. Step 3: Cross multiply
    25,920.48x = 38,881.92 × 8,391.68
  4. Step 4: Simplify right side
    25,920.48x = 326,284,630.43
  5. Step 5: Solve for x
    x = 326,284,630.43/25,920.48
  6. Step 6: Final answer
    x = 12,587.91

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1.5x scale

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.