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Finding the Fourth Proportional to 18,426.70, 27,640.05 and 5,280.40

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Solution

The fourth proportional to 18,426.70, 27,640.05 and 5,280.40 is: 7,920.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,426.70 : 27,640.05 = 5,280.40 : x
  2. Step 2: Convert to fraction form
    18,426.70/27,640.05 = 5,280.40/x
  3. Step 3: Cross multiply
    18,426.70x = 27,640.05 × 5,280.40
  4. Step 4: Simplify right side
    18,426.70x = 145,950,520.02
  5. Step 5: Solve for x
    x = 145,950,520.02/18,426.70
  6. Step 6: Final answer
    x = 7,920.60

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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.