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Finding the Fourth Proportional to 5,618.75, 8,429.11 and 1,920.11

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Solution

The fourth proportional to 5,618.75, 8,429.11 and 1,920.11 is: 2,880.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,618.75 : 8,429.11 = 1,920.11 : x
  2. Step 2: Convert to fraction form
    5,618.75/8,429.11 = 1,920.11/x
  3. Step 3: Cross multiply
    5,618.75x = 8,429.11 × 1,920.11
  4. Step 4: Simplify right side
    5,618.75x = 16,184,818.40
  5. Step 5: Solve for x
    x = 16,184,818.40/5,618.75
  6. Step 6: Final answer
    x = 2,880.50

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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.