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Finding the Fourth Proportional to 1,185.76, 1,779.24 and 638.47

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Solution

The fourth proportional to 1,185.76, 1,779.24 and 638.47 is: 958.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.76 : 1,779.24 = 638.47 : x
  2. Step 2: Convert to fraction form
    1,185.76/1,779.24 = 638.47/x
  3. Step 3: Cross multiply
    1,185.76x = 1,779.24 × 638.47
  4. Step 4: Simplify right side
    1,185.76x = 1,135,982.47
  5. Step 5: Solve for x
    x = 1,135,982.47/1,185.76
  6. Step 6: Final answer
    x = 958.02

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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.