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Finding the Fourth Proportional to 7,187.72, 9,918.89 and 4,000.87

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Solution

The fourth proportional to 7,187.72, 9,918.89 and 4,000.87 is: 5,521.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,187.72 : 9,918.89 = 4,000.87 : x
  2. Step 2: Convert to fraction form
    7,187.72/9,918.89 = 4,000.87/x
  3. Step 3: Cross multiply
    7,187.72x = 9,918.89 × 4,000.87
  4. Step 4: Simplify right side
    7,187.72x = 39,684,189.43
  5. Step 5: Solve for x
    x = 39,684,189.43/7,187.72
  6. Step 6: Final answer
    x = 5,521.11

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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.