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Finding the Fourth Proportional to 405,278.67, 607,930.30 and 139,035.35

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Solution

The fourth proportional to 405,278.67, 607,930.30 and 139,035.35 is: 208,557.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,278.67 : 607,930.30 = 139,035.35 : x
  2. Step 2: Convert to fraction form
    405,278.67/607,930.30 = 139,035.35/x
  3. Step 3: Cross multiply
    405,278.67x = 607,930.30 × 139,035.35
  4. Step 4: Simplify right side
    405,278.67x = 84,523,802,036.11
  5. Step 5: Solve for x
    x = 84,523,802,036.11/405,278.67
  6. Step 6: Final answer
    x = 208,557.24

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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.