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Finding the Fourth Proportional to 120,394.68, 180,425.95 and 90,779.97

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Solution

The fourth proportional to 120,394.68, 180,425.95 and 90,779.97 is: 136,044.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,394.68 : 180,425.95 = 90,779.97 : x
  2. Step 2: Convert to fraction form
    120,394.68/180,425.95 = 90,779.97/x
  3. Step 3: Cross multiply
    120,394.68x = 180,425.95 × 90,779.97
  4. Step 4: Simplify right side
    120,394.68x = 16,379,062,101.27
  5. Step 5: Solve for x
    x = 16,379,062,101.27/120,394.68
  6. Step 6: Final answer
    x = 136,044.73

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1.5x scale

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.