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Finding the Fourth Proportional to 1,186.61, 1,779.89 and 320.92

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Solution

The fourth proportional to 1,186.61, 1,779.89 and 320.92 is: 481.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.61 : 1,779.89 = 320.92 : x
  2. Step 2: Convert to fraction form
    1,186.61/1,779.89 = 320.92/x
  3. Step 3: Cross multiply
    1,186.61x = 1,779.89 × 320.92
  4. Step 4: Simplify right side
    1,186.61x = 571,196.24
  5. Step 5: Solve for x
    x = 571,196.24/1,186.61
  6. Step 6: Final answer
    x = 481.37

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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.