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Finding the Fourth Proportional to 1,277.10, 1,915.80 and 399.63

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Solution

The fourth proportional to 1,277.10, 1,915.80 and 399.63 is: 599.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.10 : 1,915.80 = 399.63 : x
  2. Step 2: Convert to fraction form
    1,277.10/1,915.80 = 399.63/x
  3. Step 3: Cross multiply
    1,277.10x = 1,915.80 × 399.63
  4. Step 4: Simplify right side
    1,277.10x = 765,611.15
  5. Step 5: Solve for x
    x = 765,611.15/1,277.10
  6. Step 6: Final answer
    x = 599.49

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Double scale
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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.