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Finding the Fourth Proportional to 420,762.33, 631,149.08 and 140,279.67

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Solution

The fourth proportional to 420,762.33, 631,149.08 and 140,279.67 is: 210,421.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,762.33 : 631,149.08 = 140,279.67 : x
  2. Step 2: Convert to fraction form
    420,762.33/631,149.08 = 140,279.67/x
  3. Step 3: Cross multiply
    420,762.33x = 631,149.08 × 140,279.67
  4. Step 4: Simplify right side
    420,762.33x = 88,537,383,961.81
  5. Step 5: Solve for x
    x = 88,537,383,961.81/420,762.33
  6. Step 6: Final answer
    x = 210,421.37

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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.