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Finding the Fourth Proportional to 405,317.70, 607,988.80 and 139,074.34

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Solution

The fourth proportional to 405,317.70, 607,988.80 and 139,074.34 is: 208,615.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,317.70 : 607,988.80 = 139,074.34 : x
  2. Step 2: Convert to fraction form
    405,317.70/607,988.80 = 139,074.34/x
  3. Step 3: Cross multiply
    405,317.70x = 607,988.80 × 139,074.34
  4. Step 4: Simplify right side
    405,317.70x = 84,555,641,087.39
  5. Step 5: Solve for x
    x = 84,555,641,087.39/405,317.70
  6. Step 6: Final answer
    x = 208,615.71

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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.