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Finding the Fourth Proportional to 1,276.74, 1,915.37 and 399.36

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Solution

The fourth proportional to 1,276.74, 1,915.37 and 399.36 is: 599.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.74 : 1,915.37 = 399.36 : x
  2. Step 2: Convert to fraction form
    1,276.74/1,915.37 = 399.36/x
  3. Step 3: Cross multiply
    1,276.74x = 1,915.37 × 399.36
  4. Step 4: Simplify right side
    1,276.74x = 764,913.81
  5. Step 5: Solve for x
    x = 764,913.81/1,276.74
  6. Step 6: Final answer
    x = 599.12

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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.