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Finding the Fourth Proportional to 7,320.87, 10,981.91 and 2,390.40

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Solution

The fourth proportional to 7,320.87, 10,981.91 and 2,390.40 is: 3,585.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,320.87 : 10,981.91 = 2,390.40 : x
  2. Step 2: Convert to fraction form
    7,320.87/10,981.91 = 2,390.40/x
  3. Step 3: Cross multiply
    7,320.87x = 10,981.91 × 2,390.40
  4. Step 4: Simplify right side
    7,320.87x = 26,251,157.66
  5. Step 5: Solve for x
    x = 26,251,157.66/7,320.87
  6. Step 6: Final answer
    x = 3,585.80

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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.