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Finding the Fourth Proportional to 1,277.79, 1,916.28 and 455.91

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Solution

The fourth proportional to 1,277.79, 1,916.28 and 455.91 is: 683.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.79 : 1,916.28 = 455.91 : x
  2. Step 2: Convert to fraction form
    1,277.79/1,916.28 = 455.91/x
  3. Step 3: Cross multiply
    1,277.79x = 1,916.28 × 455.91
  4. Step 4: Simplify right side
    1,277.79x = 873,651.21
  5. Step 5: Solve for x
    x = 873,651.21/1,277.79
  6. Step 6: Final answer
    x = 683.72

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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.