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Finding the Fourth Proportional to 4,779.99, 7,169.72 and 2,931.39

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Solution

The fourth proportional to 4,779.99, 7,169.72 and 2,931.39 is: 4,396.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,779.99 : 7,169.72 = 2,931.39 : x
  2. Step 2: Convert to fraction form
    4,779.99/7,169.72 = 2,931.39/x
  3. Step 3: Cross multiply
    4,779.99x = 7,169.72 × 2,931.39
  4. Step 4: Simplify right side
    4,779.99x = 21,017,230.85
  5. Step 5: Solve for x
    x = 21,017,230.85/4,779.99
  6. Step 6: Final answer
    x = 4,396.92

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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.