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Finding the Fourth Proportional to 405,281.85, 607,935.07 and 139,038.49

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Solution

The fourth proportional to 405,281.85, 607,935.07 and 139,038.49 is: 208,561.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,281.85 : 607,935.07 = 139,038.49 : x
  2. Step 2: Convert to fraction form
    405,281.85/607,935.07 = 139,038.49/x
  3. Step 3: Cross multiply
    405,281.85x = 607,935.07 × 139,038.49
  4. Step 4: Simplify right side
    405,281.85x = 84,526,375,084.56
  5. Step 5: Solve for x
    x = 84,526,375,084.56/405,281.85
  6. Step 6: Final answer
    x = 208,561.96

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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.