Home / 8,390.87-12,569.03-4,919.75

Finding the Fourth Proportional to 8,390.87, 12,569.03 and 4,919.75

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Solution

The fourth proportional to 8,390.87, 12,569.03 and 4,919.75 is: 7,369.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390.87 : 12,569.03 = 4,919.75 : x
  2. Step 2: Convert to fraction form
    8,390.87/12,569.03 = 4,919.75/x
  3. Step 3: Cross multiply
    8,390.87x = 12,569.03 × 4,919.75
  4. Step 4: Simplify right side
    8,390.87x = 61,836,460.74
  5. Step 5: Solve for x
    x = 61,836,460.74/8,390.87
  6. Step 6: Final answer
    x = 7,369.49

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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.