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Finding the Fourth Proportional to 405,006.80, 607,452.60 and 138,779.60

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Solution

The fourth proportional to 405,006.80, 607,452.60 and 138,779.60 is: 208,149.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,006.80 : 607,452.60 = 138,779.60 : x
  2. Step 2: Convert to fraction form
    405,006.80/607,452.60 = 138,779.60/x
  3. Step 3: Cross multiply
    405,006.80x = 607,452.60 × 138,779.60
  4. Step 4: Simplify right side
    405,006.80x = 84,302,028,846.96
  5. Step 5: Solve for x
    x = 84,302,028,846.96/405,006.80
  6. Step 6: Final answer
    x = 208,149.66

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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.