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Finding the Fourth Proportional to 7,187.60, 9,918.63 and 4,000.79

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Solution

The fourth proportional to 7,187.60, 9,918.63 and 4,000.79 is: 5,520.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,187.60 : 9,918.63 = 4,000.79 : x
  2. Step 2: Convert to fraction form
    7,187.60/9,918.63 = 4,000.79/x
  3. Step 3: Cross multiply
    7,187.60x = 9,918.63 × 4,000.79
  4. Step 4: Simplify right side
    7,187.60x = 39,682,355.72
  5. Step 5: Solve for x
    x = 39,682,355.72/7,187.60
  6. Step 6: Final answer
    x = 5,520.95

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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.