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Finding the Fourth Proportional to 2,631.19, 3,946.11 and 781.87

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Solution

The fourth proportional to 2,631.19, 3,946.11 and 781.87 is: 1,172.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.19 : 3,946.11 = 781.87 : x
  2. Step 2: Convert to fraction form
    2,631.19/3,946.11 = 781.87/x
  3. Step 3: Cross multiply
    2,631.19x = 3,946.11 × 781.87
  4. Step 4: Simplify right side
    2,631.19x = 3,085,345.03
  5. Step 5: Solve for x
    x = 3,085,345.03/2,631.19
  6. Step 6: Final answer
    x = 1,172.60

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1.5x scale

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.