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Finding the Fourth Proportional to 2,631.13, 3,945.57 and 986.53

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Solution

The fourth proportional to 2,631.13, 3,945.57 and 986.53 is: 1,479.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.13 : 3,945.57 = 986.53 : x
  2. Step 2: Convert to fraction form
    2,631.13/3,945.57 = 986.53/x
  3. Step 3: Cross multiply
    2,631.13x = 3,945.57 × 986.53
  4. Step 4: Simplify right side
    2,631.13x = 3,892,423.17
  5. Step 5: Solve for x
    x = 3,892,423.17/2,631.13
  6. Step 6: Final answer
    x = 1,479.37

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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.