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Finding the Fourth Proportional to 1,277.19, 1,915.95 and 455.55

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Solution

The fourth proportional to 1,277.19, 1,915.95 and 455.55 is: 683.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.19 : 1,915.95 = 455.55 : x
  2. Step 2: Convert to fraction form
    1,277.19/1,915.95 = 455.55/x
  3. Step 3: Cross multiply
    1,277.19x = 1,915.95 × 455.55
  4. Step 4: Simplify right side
    1,277.19x = 872,811.02
  5. Step 5: Solve for x
    x = 872,811.02/1,277.19
  6. Step 6: Final answer
    x = 683.38

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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.