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Finding the Fourth Proportional to 30,779.80, 42,479.51 and 17,861.92

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Solution

The fourth proportional to 30,779.80, 42,479.51 and 17,861.92 is: 24,651.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,779.80 : 42,479.51 = 17,861.92 : x
  2. Step 2: Convert to fraction form
    30,779.80/42,479.51 = 17,861.92/x
  3. Step 3: Cross multiply
    30,779.80x = 42,479.51 × 17,861.92
  4. Step 4: Simplify right side
    30,779.80x = 758,765,652.70
  5. Step 5: Solve for x
    x = 758,765,652.70/30,779.80
  6. Step 6: Final answer
    x = 24,651.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.