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Finding the Fourth Proportional to 2,242.87, 3,364.61 and 781.68

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Solution

The fourth proportional to 2,242.87, 3,364.61 and 781.68 is: 1,172.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,242.87 : 3,364.61 = 781.68 : x
  2. Step 2: Convert to fraction form
    2,242.87/3,364.61 = 781.68/x
  3. Step 3: Cross multiply
    2,242.87x = 3,364.61 × 781.68
  4. Step 4: Simplify right side
    2,242.87x = 2,630,048.34
  5. Step 5: Solve for x
    x = 2,630,048.34/2,242.87
  6. Step 6: Final answer
    x = 1,172.63

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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.