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Finding the Fourth Proportional to 1,186.60, 1,779.90 and 320.89

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Solution

The fourth proportional to 1,186.60, 1,779.90 and 320.89 is: 481.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.60 : 1,779.90 = 320.89 : x
  2. Step 2: Convert to fraction form
    1,186.60/1,779.90 = 320.89/x
  3. Step 3: Cross multiply
    1,186.60x = 1,779.90 × 320.89
  4. Step 4: Simplify right side
    1,186.60x = 571,152.11
  5. Step 5: Solve for x
    x = 571,152.11/1,186.60
  6. Step 6: Final answer
    x = 481.34

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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.