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Finding the Fourth Proportional to 8,390.79, 12,578.90 and 4,920.75

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Solution

The fourth proportional to 8,390.79, 12,578.90 and 4,920.75 is: 7,376.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390.79 : 12,578.90 = 4,920.75 : x
  2. Step 2: Convert to fraction form
    8,390.79/12,578.90 = 4,920.75/x
  3. Step 3: Cross multiply
    8,390.79x = 12,578.90 × 4,920.75
  4. Step 4: Simplify right side
    8,390.79x = 61,897,597.57
  5. Step 5: Solve for x
    x = 61,897,597.57/8,390.79
  6. Step 6: Final answer
    x = 7,376.85

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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.