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Finding the Fourth Proportional to 25,920.68, 38,887.18 and 8,390.50

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Solution

The fourth proportional to 25,920.68, 38,887.18 and 8,390.50 is: 12,587.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,920.68 : 38,887.18 = 8,390.50 : x
  2. Step 2: Convert to fraction form
    25,920.68/38,887.18 = 8,390.50/x
  3. Step 3: Cross multiply
    25,920.68x = 38,887.18 × 8,390.50
  4. Step 4: Simplify right side
    25,920.68x = 326,282,765.60
  5. Step 5: Solve for x
    x = 326,282,765.60/25,920.68
  6. Step 6: Final answer
    x = 12,587.74

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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.