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Finding the Fourth Proportional to 1,277.61, 1,915.77 and 455.76

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Solution

The fourth proportional to 1,277.61, 1,915.77 and 455.76 is: 683.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.61 : 1,915.77 = 455.76 : x
  2. Step 2: Convert to fraction form
    1,277.61/1,915.77 = 455.76/x
  3. Step 3: Cross multiply
    1,277.61x = 1,915.77 × 455.76
  4. Step 4: Simplify right side
    1,277.61x = 873,131.34
  5. Step 5: Solve for x
    x = 873,131.34/1,277.61
  6. Step 6: Final answer
    x = 683.41

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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.