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Finding the Fourth Proportional to 338,438.60, 507,608.70 and 89,120.36

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Solution

The fourth proportional to 338,438.60, 507,608.70 and 89,120.36 is: 133,667.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,438.60 : 507,608.70 = 89,120.36 : x
  2. Step 2: Convert to fraction form
    338,438.60/507,608.70 = 89,120.36/x
  3. Step 3: Cross multiply
    338,438.60x = 507,608.70 × 89,120.36
  4. Step 4: Simplify right side
    338,438.60x = 45,238,270,083.13
  5. Step 5: Solve for x
    x = 45,238,270,083.13/338,438.60
  6. Step 6: Final answer
    x = 133,667.58

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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.