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Finding the Fourth Proportional to 389,779.56, 537,999.78 and 220,113

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Solution

The fourth proportional to 389,779.56, 537,999.78 and 220,113 is: 303,814.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,779.56 : 537,999.78 = 220,113 : x
  2. Step 2: Convert to fraction form
    389,779.56/537,999.78 = 220,113/x
  3. Step 3: Cross multiply
    389,779.56x = 537,999.78 × 220,113
  4. Step 4: Simplify right side
    389,779.56x = 118,420,745,575.14
  5. Step 5: Solve for x
    x = 118,420,745,575.14/389,779.56
  6. Step 6: Final answer
    x = 303,814.66

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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.