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Finding the Fourth Proportional to 4,947.87, 7,421.85 and 1,987.68

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Solution

The fourth proportional to 4,947.87, 7,421.85 and 1,987.68 is: 2,981.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,947.87 : 7,421.85 = 1,987.68 : x
  2. Step 2: Convert to fraction form
    4,947.87/7,421.85 = 1,987.68/x
  3. Step 3: Cross multiply
    4,947.87x = 7,421.85 × 1,987.68
  4. Step 4: Simplify right side
    4,947.87x = 14,752,262.81
  5. Step 5: Solve for x
    x = 14,752,262.81/4,947.87
  6. Step 6: Final answer
    x = 2,981.54

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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.