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Finding the Fourth Proportional to 1,186.57, 1,779.51 and 455.75

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Solution

The fourth proportional to 1,186.57, 1,779.51 and 455.75 is: 683.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.57 : 1,779.51 = 455.75 : x
  2. Step 2: Convert to fraction form
    1,186.57/1,779.51 = 455.75/x
  3. Step 3: Cross multiply
    1,186.57x = 1,779.51 × 455.75
  4. Step 4: Simplify right side
    1,186.57x = 811,011.68
  5. Step 5: Solve for x
    x = 811,011.68/1,186.57
  6. Step 6: Final answer
    x = 683.49

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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.