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Finding the Fourth Proportional to 8,920.88, 12,310.81 and 5,384.09

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Solution

The fourth proportional to 8,920.88, 12,310.81 and 5,384.09 is: 7,430.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.88 : 12,310.81 = 5,384.09 : x
  2. Step 2: Convert to fraction form
    8,920.88/12,310.81 = 5,384.09/x
  3. Step 3: Cross multiply
    8,920.88x = 12,310.81 × 5,384.09
  4. Step 4: Simplify right side
    8,920.88x = 66,282,480.16
  5. Step 5: Solve for x
    x = 66,282,480.16/8,920.88
  6. Step 6: Final answer
    x = 7,430.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.