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Finding the Fourth Proportional to 405,806.55, 608,703.68 and 139,569.38

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Solution

The fourth proportional to 405,806.55, 608,703.68 and 139,569.38 is: 209,351.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,806.55 : 608,703.68 = 139,569.38 : x
  2. Step 2: Convert to fraction form
    405,806.55/608,703.68 = 139,569.38/x
  3. Step 3: Cross multiply
    405,806.55x = 608,703.68 × 139,569.38
  4. Step 4: Simplify right side
    405,806.55x = 84,956,391,479.95
  5. Step 5: Solve for x
    x = 84,956,391,479.95/405,806.55
  6. Step 6: Final answer
    x = 209,351.95

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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.